umetco minerals corporation uravan superfund …effective. this is accomplished through a site...

UNITED STATES ENVIRONMENTAL PROTECTION AGENCYREGION 8

999 18th STREET - SUITE 500DENVER, CO 80202-2466

UMETCO MINERALS CORPORATIONURAVAN SUPERFUND SITE

URAVAN, COLORADO

FIVE-YEAR REVIEW REPORT

MARCH 2000

FINAL

FIVE-YEAR REVIEW

UMETCO MINERALS CORPORATIONURAVAN SUPERFUND SITE

URAVAN, COLORADO

March 13, 2000

RAC Contract No. 68-W7-0039

Work Assignment Number 005-FRFE-BE-0846

Prepared for:

U.S. Environmental Protection Agency, Region VIII

Prepared by:

MORRISON KNUDSEN CORPORATION10822 West Toller DriveLittleton, Colorado 80127

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EXECUTIVE SUMMARY

Morrison Knudsen Corporation (MK) was tasked by the United States Environmental Protection Agency

(EPA) Region VIII to conduct a Five-Year Review of the Umetco Minerals Corporation Uravan

Superfund Site to evaluate whether the remedial actions taken at the site to date remain protective of human

health and the environment. The purpose of this review is to confirm that the selected remedies remain

effective. This is accomplished through a site visit, review of the administrative records, and review of

applicable or relevant and appropriate requirements (ARARs).

The Uravan site was contaminated by radioactive residues resulting from the processing of vanadium- and

uranium-containing ores from the early 1900s through the mid-1980s. In December 1983, the State of

Colorado filed a natural resources damages claim against Union Carbide and Carbon Corporation and

Umetco under the Comprehensive Environmental Response Compensation and Liability Act (CERCLA).

The site was proposed to the National Priorities List (NPL) in 1984 and was finalized to the NPL in 1986.

In 1985, Umetco and the State of Colorado began discussions concerning remedial action and cleanup of

the site. The results of these discussions was the preparation of a Consent Decree and Remedial Action

Plan (RAP) in 1986 that outlined the requirements for Umetco to remediate the site. The United States

District Court for the State of Colorado approved the Consent Decree and RAP in 1987.

Remedial actions conducted to date include:

• Removal and cleanup of dispersed materials and contaminated soils from approximately 340 acres

• Relocating more than 1.8 million cubic yards of mill wastes and contaminated materials to secure

repositories on Club Mesa

• Constructing covers for the secure repositories with more than 1.7 million cubic yards of earthen

materials

• Constructing five double-lined ponds totaling 40 acres for the evaporation of hillside seepage,

tailings pile seepage and extracted ground water

• Demolition and removal to the Uravan tailings pile of approximately 50 major mill facility structures

and buildings, including the process circuits, and removal of more than 260 buildings in the town

of Uravan

• Collection of more than 38 million gallons of hillside and tailings pile seepage containing

approximately 3,000 tons of inorganic compound contamination. Seepage was placed into the Club

Ranch Evaporation Ponds for evaporation

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• Extraction of approximately 157 million gallons of contaminated ground water with removal of

approximately 10,000 tons of inorganic compound contamination. Contaminated ground water was

placed into the Club Ranch Evaporation Ponds for evaporation

• Removing contaminated materials from both the Old and New Town Dumps. Materials were

placed into the Club Mesa Tailing Piles.

Review of Annual Environmental Monitoring Data Reports from 1994, 1995, 1996, 1997, and 1998

indicate the following:

• Ambient air particulate concentrations of radionuclides at Uravan has generally decreased over the

past five years

• Total suspended particulate (TSP) concentrations exceeded permit values several times in the last

five years. The majority of the exceedences reportedly occurred when a subcontractor to the

Department of Energy (over which Umetco had no control) was placing Uranium Mill Tailings

Remedial Act (UMTRA) materials in the Burbank Repository. Otherwise, TSP concentrations

were generally within acceptable levels

• Concentrations of radionuclides, metals, or other inorganic contaminants in the San Miguel River

at Uravan have not changed over the past five years and appear to be equivalent at all six sampling

sites throughout the Uravan site, although this has not been tested statistically by Umetco

• Concentrations of total dissolved solids in the Kayenta formation beneath the Club Ranch

Evaporation Ponds has decreased an average 73 percent in the higher permeability zones and 37

percent in lower permeability zones in the last eight years of ground water extraction

• Ionizing radiation doses to site workers over the last five years were less than six percent of the

allowable dose for radiation workers set by the Nuclear Regulatory Commission (NRC) and the

State of Colorado

• Environmental ionizing radiation doses to the nearest resident in the last five years were less than

the public dose limits set by the NRC and the State of Colorado.

Environmental conditions identified during this Five-Year Review that remain to be addressed or completed

included:

1. A small seep was recently discovered along the west wall of Tailings Pile #1-2 abutting the

adjoining mesa. The source(s) of this seep is currently not known. Based upon visual

observations of the seep area, it does not appear that the tailings pile has been negatively

impacted by this seep. It does raise concerns, however, of the potential presence of

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additional seeps in this tailing pile that could eventually negatively impact the tailings pile. It is

recommended that investigations into the cause(s) and source(s) of this seep be immediately

undertaken, determine whether the structural integrity of Tailings Pile#1-2 may be impacted, and

what mitigation measures can be conducted to minimize future infiltration into the tailings pile.

2. A joint separation, e.g., a separation between the tailings material and the back wall of the tailings

pile, was discovered in Tailings Pile #3 in 1993. Investigations into the cause of the separation have

been conducted over the last six years, but the remedial action alternative submitted to the State

for approval has not been implemented. The joint separation should be repaired by the end of

calendar year 2000 so that it can be monitored prior to total closure of Tailings Pile #3 by the end

of December 2002.

3. Plans for completing the remediation of the hillside beneath the former B-Plant, where the concrete

foundations and appurtenant concrete structures associated with the former Vanadium Plant were

removed, have not been submitted by Umetco to the State for review and approval. As any

remedial activity of this site may be subject to a risk based cleanup determination, it is essential that

plans be submitted and approved by the State of Colorado as soon as possible so that remediation

of this area is completed before the end of December 2002.

In summary, remedial activities at the Umetco Minerals Corporation Uravan Remedial Action Project are

being conducted in general accordance with the Consent Decree and the RAP and are scheduled for

completion by the end of December, 2002. Based on available information, it appears that selected

remedies remain effective in protecting the health of the public and environment.

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TABLE OF CONTENTS

Section Page Number

1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1-

2.0 SITE BACKGROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1-

3.0 REGULATORY COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -3-3.1 Statutory Review. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4-3.2 ARARs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4-

4.0 DESCRIPTIONS OF REMEDIAL ACTIONS AT SPECIFIED AREAS . . . . . . . . -6-4.1 Atkinson Creek Crystal Disposal Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6-

4.1.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6-4.1.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6-4.1.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . -6-

4.1.3.1 Status December 1993 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6-4.1.3.2 Status October 1999 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7-

4.1.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . . . -7-4.1.5 Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7-

4.2 Club Ranch Ponds Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12-4.2.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12-4.2.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12-4.2.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -12-

4.2.3.1 Status December 1993 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12-4.2.3.2 Status October 1999 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -13-

4.2.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . . -14-4.2.5 Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15-

4.3 River Ponds Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20-4.3.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20-4.3.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20-4.3.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -20-



4.4 Club Mesa Tailings Piles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -26-4.4.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -26-4.4.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -26-4.4.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -26-



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TABLE OF CONTENTS, Continued

4.5 Club Mesa Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -39-4.5.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -39-4.5.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -39-4.5.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -39-



4.6 Mill Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -53-4.6.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -53-4.6.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -53-4.6.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -53-


4.6.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . . -55-4.6.5 Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55-

4.7 Town and Adjacent Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -69-4.7.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -69-4.7.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -69-4.7.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -69-



4.8 Burbank Quarry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -88-4.8.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -88-4.8.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -88-4.8.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -88-



4.9 Borrow Areas on Club Mesa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -95-4.9.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -95-4.9.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -95-4.9.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . -95-



5.0 DESCRIPTIONS OF REMEDIAL ACTIONS - LIQUIDS . . . . . . . . . . . . . . . . . . -98-

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5.1 Hillside Seepage and Tailings Liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -98-5.1.1 Hillside Seepage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -98-

5.1.1.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -98-5.1.1.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -98-5.1.1.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . -98-

5.1.1.3.1 Status December 1993 . . . . . . . . . . . . . . . . . . . . -98-5.1.1.3.2 Status October 1999 . . . . . . . . . . . . . . . . . . . . . . -99-

5.1.1.4 Summary of Site Visit Observations and Findings . . . . . . -100-5.1.1.5 Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -101-

5.1.2 Toe Berm Seepage and Tailing Dewatering Liquids . . . . . . . . . . . . -106-5.1.2.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -106-5.1.2.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -106-5.1.2.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . -106-

5.1.2.3.1 Status December 1993 . . . . . . . . . . . . . . . . . . . -106-5.1.2.3.2 Status October 1999 . . . . . . . . . . . . . . . . . . . . . -107-

5.1.2.4 Summary of Site Visit Observations and Findings . . . . . . -107-5.1.2.5 Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -108-

5.2 Ponded Liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -112-5.2.1 Club Ranch Ponds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -112-

5.2.1.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -112-5.2.1.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -112-5.2.1.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . -112-


5.2.1.4 Summary of Site Visit Observations and Findings . . . . . . -113-5.2.2 Other Liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -115-



5.2.2.4 Summary of Site Visit Observations and Findings . . . . . . -116-5.3 Surface Runoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -118-

5.3.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -118-5.3.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -118-5.3.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . -118-

5.3.3.1 Status December 1993 . . . . . . . . . . . . . . . . . . . . . . . . . . . . -118-5.3.3.2 Status October 1999 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -118-

5.3.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . -119-5.4 Ground Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -122-

5.4.1 Club Mesa Salt Wash Member of the Morrison Formation . . . . . -122-5.4.1.1 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -122-

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5.4.1.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -122-5.4.1.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . -122-


5.4.1.4 Summary of Site Visit Observations and Findings . . . . . . -123-5.4.2 Club Mesa - Kayenta-Wingate Sequence . . . . . . . . . . . . . . . . . . . . -127-



5.4.2.4 Summary of Site Visit Observations and Findings . . . . . . -129-5.4.3 River Valley - Kayenta-Wingate Sequence . . . . . . . . . . . . . . . . . . . -132-



5.4.3.4 Summary of Site Visit Observations and Findings . . . . . . -139-

6.0 MISCELLANEOUS REMEDIAL ACTION PLAN REQUIREMENTS . . . . . . . -144-6.1 Off-Site Dose Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -144-

6.1.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -144-6.1.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -144-6.1.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . -144-


6.1.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . -145-6.2 Health, Safety, and Environmental Procedures . . . . . . . . . . . . . . . . . . . . . . -148-



6.2.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . -149-6.3 Area Source Air Emissions Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -151-



6.3.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . -152-

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6.4 Personnel and Facility Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -154-6.4.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -154-6.4.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -154-6.4.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . -154-


6.4.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . -155-6.5 Facility Alpha Contamination Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . -160-

6.5.1 Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -160-6.5.2 Remedial Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -160-6.5.3 Site Status and RAP Requirements . . . . . . . . . . . . . . . . . . . . . . . . . -160-


6.5.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . -160-6.6 Environmental Monitoring and Analysis Program . . . . . . . . . . . . . . . . . . . -162-


6.6.3.1 Status December 1993 . . . . . . . . . . . . . . . . . . . . . . . . . . . . -162-6.6.3.2 Status October 1999 . . . . . . . . . . . . . . . . . . . . . . . . . . . . -162-

6.6.4 Summary of Site Visit Observations and Findings . . . . . . . . . . . . . -165-6.6.5 Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -165-

7.0 COLORADO RADIOACTIVE MATERIALS LICENSE REQUIREMENTS . . -167-

7.1 Meteorology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -167-7.1.1 Precipitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -167-7.1.2 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -167-

7.2 Stack Emission Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -167-7.3 River Sediment, Soils, Vegetation, and Grazing Uptake Monitoring . . . . -167-

7.3.1 River Sediment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -167-7.3.2 Soils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -168-7.3.3 Vegetation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -168-7.3.4 Grazing Uptake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -169-

7.4 Tailings Piles #1-2, 3, and the Burbank Repository . . . . . . . . . . . . . . . . . . -169-7.4.1 Tailings Pile #1-2: Lateral Movement . . . . . . . . . . . . . . . . . . . . . . . -169-7.4.2 Tailings Pile #3: Lateral Movement . . . . . . . . . . . . . . . . . . . . . . . . -169-7.4.3 Burbank Repository: Lateral Movement . . . . . . . . . . . . . . . . . . . . -169-7.4.4 Tailings Pile #1-2: Settlement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -170-7.4.5 Tailings Pile #3: Settlement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -170-7.4.6 Burbank Repository: Settlement . . . . . . . . . . . . . . . . . . . . . . . . . . . -170-7.4.7 Tailings Pile #1-2: Phreatic Level . . . . . . . . . . . . . . . . . . . . . . . . . . -170-7.4.8 Tailings Pile #3: Phreatic Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . -170-

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7.4.9 Burbank Repository: Phreatic Level . . . . . . . . . . . . . . . . . . . . . . . . -171-7.4.10 Tailings Pile #1-2 and 3: Drainage . . . . . . . . . . . . . . . . . . -171-

7.5 Rim Erosion Monuments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -171-7.6 National Pollutant Discharge Elimination System (NPDES) and Storm Water

Management Plan Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -171-7.7 Surface Water Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -172-

7.7.1 Club Ranch Ponds Water Balance . . . . . . . . . . . . . . . . . . . . . . . . . . -172-7.7.2 Runoff Collection Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -172-7.7.3 Hillside Seepage Collection Monitoring . . . . . . . . . . . . . . . . . . . . . -172-

7.8 San Miguel River Water Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -172-7.9 Aquatic Bioassay Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -172-7.10 Ground Water Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -173-

7.10.1 Club Mesa - Salt Wash Monitoring Wells . . . . . . . . . . . . . . . . . . . . -173-7.10.2 Club Mesa - Kayenta/Wingate Sequence Monitoring Wells . . . . . -173-7.10.3 San Miguel River Valley - Kayenta/Wingate Sequence Monitoring Wells

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -173-7.11 ALARA and Off-Site Radiation Dose Monitoring . . . . . . . . . . . . . . . . . . . -173-

7.11.1 Umetco Site Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -173-7.11.2 Off-Site Radiation Doses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -174-

7.12 Land Use Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -174-7.13 Sediment Catchment Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -174-7.14 Water Balance Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -174-7.15 Analytical Laboratory Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . -175-

8.0 COMMUNITY RELATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -175-

9.0 NATIONAL HISTORIC PRESERVATION ACT . . . . . . . . . . . . . . . . . . . . . . . . . -176-9.1 Summary of Section 106 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . -176-9.2 Status of Uravan and the Uravan Superfund Site With the National Historic

Preservation Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -178-9.3 History of Discussions/Actions Concerning the National Historic Preservation Act

at the Uravan Superfund Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -179-9.4 Evaluation of Site’s Compliance With Section 106 Requirements . . . . . . . -181-9.5 Observations of Site Visit, October 13 and 14, 1999 . . . . . . . . . . . . . . . . . -182-9.6 Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -183-

10.0 SUMMARY OF SITE VISIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -183-

11.0 SUMMARY AND RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -187-

12.0 REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -189-

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LIST OF TABLES

Table 3.2-1 ARARs Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Table 4.1.3-1 Atkinson Creek Disposal Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Table 4.2.3-1 Club Ranch Ponds Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Table 4.3.3-1 River Ponds Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Table 4.4.3-1 Club Mesa Tailings Piles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Table 4.5.3-1 Club Mesa Disposal Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Table 4.6.3-1 Mill Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Table 4.7.3-1 Town and Adjacent Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69Table 4.8.3-1 Burbank Quarry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84Table 4.9.3-1 Borrow Areas on Club Mesa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90Table 5.1.1.3-1 Hillside Seepage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95Table 5.1.2.3-1 Toe Drain Collection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101Table 5.2.1.3-1 Club Ranch Ponds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106Table 5.2.2.3-1 Other Liquids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109Table 5.3.3-1 Surface Water Runoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112Table 5.4.1.3-1 Club Mesa Salt Wash Member of the Morrison Formation . . . . . . . 117Table 5.4.2.3-1 Club Mesa - Kayenta-Wingate Sequence . . . . . . . . . . . . . . . . . . . . . . 122Table 5.4.3.3.2-1 Comparison of TDS Concentrations in River Valley Wells, Maximum

Concentrations, 1997 Concentrations, and 1998 Concentrations . . . . 129Table 5.4.3.3-1 River Valley - Kayenta-Wingate Sequence . . . . . . . . . . . . . . . . . . . . . 131Table 6.1.3-1 Off-Site Dose Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138Table 6.2.3-1 Health, Safety, and Environmental Procedures . . . . . . . . . . . . . . . . . . 141Table 6.3.3-1 Area Air Source Emissions Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 144Table 6.4.3-1 Personnel and Facility Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147Table 6.5.3-1 Facility Alpha Contamination Sampling . . . . . . . . . . . . . . . . . . . . . . . . 152Table 6.6.3-1 Environmental Monitoring and Analysis Program . . . . . . . . . . . . . . . 157

APPENDIX 1 FIGURES

Figure 2-1: Site Location MapFigure 2-2: Site Plan 1999Figure 2-3: Site Plan 1999Figure 4-1: Club Ranch PondsFigure 5.1.1-1: Hillside Seepage Collection SystemFigure 5.1.2-1: Toe Drain Collection SystemFigure 5.3.3-1: Runoff Collection SystemFigure 5.4.1-1: Location of Monitoring Wells, Club Mesa AreaFigure 5.4.3.3-1: Original Monitoring Well Locations, Club Ranch Ponds AreaFigure 5.4.3.3-2: Location of Monitoring Well Locations, Club Ranch Ponds Area, March

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1994Figure 5.4.3.3-3: Location of Monitoring and Withdrawal Well Locations, Club Ranch

Ponds Area, October 1999Figure 6.6-1: Locations of Soil and Ambient Air Monitoring StationsFigure 7.4.1-1: Locations of Movement Monuments, Tailings Piles #1-2 and #3Figure 7.4.4-1: Locations of Settlement Monuments, Tailings Piles #1-2 and #3Figure 7.4.7-1: Locations of Piezometers, Tailings Piles #1-2 and #3

APPENDIX 2 PHOTOGRAPHS

Photo 2-1: Aerial Photograph of Uravan Superfund Site, July 1989Photo 2-2: Aerial Photograph of Uravan Superfund Site, August 1997Photo 4.1-1: Atkinson Creek Disposal Area, October 1999Photo 4.1-2: Atkinson Creek Disposal Area, October 1999Photo 4.2-1: Club Ranch Evaporation Ponds, May 1989Photo 4.2-2: Lower Club Ranch Evaporation Ponds, May 1989Photo 4.2-3: Club Ranch Ponds #1, #4, #6, 7, and #8, October 1999Photo 4.2-4: Club Ranch Pond #1 With Raffinate Crystals, October 1999Photo 4.2-5: Raffinate Crystals Below Club Ranch Pond #1, June 1987Photo 4.3-1: River Ponds Area Cleanup, Ongoing, May 1989Photo 4.3-2: River Ponds Area Cleanup, Complete, July 1989Photo 4.3-3: River Ponds Area, Foreground, With Trees, October 1999Photo 4.4-1: Regrading and Contouring of Tailings Pile #1-2, May 1989Photo 4.4-2: Regrading of Tailings Pile #1-2 Slope, B-Plant in Background, May 1989Photo 4.4-3: Top of Tailings Pile #3, October 1999Photo 4.4-4: Joint Separation in Tailings Pile #3, October 1999Photo 4.4-5: Joint Separation in Tailings Pile #3, October 1999Photo 4.4-6: Top of Tailings Pile #1-2, October 1999Photo 4.4-7: Diversion Ditch on Top of Tailings Pile #1-2, October 1999Photo 4.4-8: Slope of Tailings Pile #1-2, October 1999Photo 4.4-9: Tailings Pile #1-2, Ground Water Seepage, October 1999Photo 4.4-10: Tailings Pile #1-2, Ground Water Seepage, October 1999Photo 4.5-1: Club Mesa Disposal Area Cleanup, May 1989Photo 4.5-2: Club Mesa Disposal Area Cleanup, May 1989Photo 4.5-3: Club Mesa Disposal Area, October 1999Photo 4.5-4: Club Mesa Disposal Area, October 1999Photo 4.6-1: A-Plant Area, July 1989Photo 4.6-2: A-Plant Area, Foreground, B-Plant on Top of Mesa, July 1989Photo 4.6-3: B-Plant, May 1989Photo 4.6-4: A-Plant, October 1999Photo 4.6-5: A-Plant Area, October 1999

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Photo 4.6-6: B-Plant Area, Showing B-Plant Repository and Return Water Ponds,October 1999

Photo 4.6-7: B-Plant Area, October 1999Photo 4.6-8: Former Boneyard Area, October 1999Photo 4.7-1: Panorama Plate 1 of 3, Town of Uravan, July 1989Photo 4.7-2: Panorama Plate 2 of 3, Town of Uravan, July 1989Photo 4.7-3: Panorama Plate 3 of 3, Town of Uravan, July 1989Photo 4.7-4: Panorama Plate 1 of 5, Town of Uravan, October 1999Photo 4.7-5: Panorama Plate 2 of 5, Town of Uravan, October 1999Photo 4.7-6: Panorama Plate 3 of 5, Town of Uravan, October 1999Photo 4.7-7: Panorama Plate 4 of 5, Town of Uravan, October 1999Photo 4.7-8: Panorama Plate 5 of 5, Town of Uravan, October 1999Photo 4.7-9: Hillside Area Below B-Plant With Concrete Structures, July 1989Photo4.7-10: Hillside Area Below B-Plant Without Concrete Structures, October 1999Photo 4.8-1: Burbank Quarry Repository, May 1989Photo 4.8-2: Burbank Quarry Repository, October 1999Photo 4.8-3: Burbank Quarry Repository, October 1999Photo 4.8-4: Burbank Quarry Repository, October 1999Photo 4.9-1: Club Mesa Borrow Area, October 1999Photo 4.9-2: Club Mesa Borrow Area, October 1999Photo 4.9-3: Club Mesa Borrow Area, October 1999Photo 5.1.1.5-1: Hillside Collection System Along County Road EE-22, October 1999Photo 5.1.1.5-2: Hillside Collection System Along County Road EE-22, October 1999Photo 5.1.1.5-3: Hillside Collection System Along County Road EE-22, October 1999Photo 5.1.1.5-4: Lower Pond Along County Road EE-22, October 1999Photo 5.1.1.5-5: Middle Pond Along B-Plant Road, October 1999Photo 5.1.1.5-6: Lined Runoff Collection Pond RC-4, October 1999Photo 5.1.2.5-1: Toe Drain Collection Sump #2 and Associated Piping, October 1999Photo 6.6.5-1: TSP-2 Air Monitoring Station, October 1999Photo 6.6.5-2: Tabeguache Air Monitoring Station, October 1999Photo 6.6.5-3: Tabeguache Air Monitoring Station Radon Track Etch Cups, October

1999Photo 6.6.5-4: Club Mesa Air Monitoring Station, October 1999Photo 6.6.5-5: Atkinson Creek Air Monitoring Station, October 1999Photo 9.4-1: Boarding House (Left) and Community Center (Right), October 1999Photo 9.4-2: Boarding House, October 1999Photo 9.4-3: Community Center, October 1999Photo 9.4-4: Boarding House and Remediated A-Plant Area, October 1999

APPENDIX 3: SUMMARY OF GROUND WATER MONITORING RESULTS CLUBMESA SALT WASH MEMBER OF THE MORRISON FORMATIONMONITORING WELLS 1994-1998

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APPENDIX 4: SUMMARY OF GROUND WATER MONITORING RESULTS CLUBMESA KAYENTA-WINGATE MONITORING WELLS 1994-1998

APPENDIX 5: SUMMARY OF GROUND WATER MONITORING RESULTS SANMIGUEL RIVER VALLEY KAYENTA-WINGATE SEQUENCEMONITORING WELLS 1994-1998

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LIST OF ACRONYMS

ARARs Applicable or Relevant and Appropriate RequirementsBGS Below Ground SurfaceCDPHE Colorado Department of Public Health and the EnvironmentCCR Code of Colorado RegulationsCFR Code of Federal RegulationsCERCLA Comprehensive Environmental Response, Compensation, and Liability Actcm2 Square CentimeterDOE United States Department of EnergyDPM Disintegrations per MinuteEPA United States Environmental Protection AgencyHDPE High Density PolyethyleneMK Morrison Knudsen CorporationmREM MilliremFg/L Microgram per LiterFg/m3 Microgram per Cubic MeterMSDS Material Safety Data SheetNCP National Contingency PlanNRI National Radium InstituteNPL National Priorities ListNRC Nuclear Regulatory CommissionOSWER Office of Solid Waste and Emergency ResponseRAC Response Action ContractRAP Remedial Action PlanRI/FS Remedial Investigation/Feasibility StudyRSO Radiation Safety OfficerSARA Superfund Amendments and Reauthorization ActSHPO State Historic Preservation OfficerTDS Total Dissolved SolidsTEDE Total Effective Dose EquivalentTHPO Tribal Historic Preservation OfficerTSP Total Suspended ParticulatesUCC Union Carbide and Carbon CorporationUMTRA Uranium Mill Tailings Remedial ActWD Withdrawal Well

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1.0 INTRODUCTION

Morrison Knudsen Corporation (MK) was tasked by the United States Environmental Protection Agency

(EPA) Region VIII to conduct a Five-Year Review of the Umetco Minerals Corporation Uravan

Superfund Site to evaluate whether the response actions taken at the site to-date remain protective of

human health and the environment. The purpose of this review is to confirm that the selected remedies

remain effective. The review was conducted under EPA Response Action Contract (RAC) No.

68-W7-0039, Work Assignment Number 005-FRFE-BE-0836.

This Five-Year Review was conducted according to procedures outlined in Office of Solid Waste and

Emergency Response (OSWER) Directive 9355.7-02, Structure and Components of Five-Year Reviews;

OSWER Directive 9355.7-02A, Supplemental Five-Year Review Guidance; and OSWER Directive

9355.7-03A, Second Supplemental Five-Year Review Guidance, and is consistent with the provisions of

the Superfund Amendments and Reauthorization Act of 1986 (SARA), the Comprehensive Environmental

Response, Compensation, and Liability Act (CERCLA) (42 USC 9601, et. seq.), and the National

Contingency Plan (NCP).

2.0 SITE BACKGROUND

The site is located in the western portion of Montrose County on Highway 141 approximately 13 miles

northwest of the Town of Nucla and 81 miles south of the Town of Whitewater in Mesa County (Figure

2-1). The town of Uravan was demolished during remedial activities at the site and, except for a couple

of historical buildings, no longer exists. The City of Montrose is 115 miles southeast of Uravan, and Grand

Junction is located 90 miles to the northeast. The site is located on the bank of the San Miguel River which

drains into the Colorado River. Figures 2-2 and 2-3 show the layout of the Uravan Site as of 1999.

Mining operations in this area of Colorado began in the early 1900s. Mining of radium-bearing carnotite

ore (K2(UO2)(VO4)2) began in approximately 1910 when Standard Chemical Company first acquired

mining claims in the area. The Standard Chemical Company built a radium recovery mill known as the Joe

Junior Mill in 1914. The mill was located on the valley floor along the San Miguel River at the site of what

later became known as “A-Plant”.

In 1929, the U.S. Vanadium Corporation, a subsidiary of Union Carbide and Carbon Corporation (UCC)

purchased the Standard Chemical Company’s claims in the area. U.S. Vanadium Corporation expanded

the A-Plant in 1934, constructing a mill and roasting plant to recover vanadium from the


carnotite ore. The town of Uravan was established in 1935 to house workers and their families at the mill

and mine facilities. In 1937 and 1938, the mill reportedly was also extracting uranium from the ore through

uranium recovery circuits. During this operation, approximately 250,000 pounds of triuranium octoxide

(U3O8) was produced in the form of green sludge. This sludge was refined in Uravan and vanadium and

uranium concentrates were produced.

The Uravan mill’s capacity was expanded in the early 1940s and 1950s to meet the demand for uranium

required by the United States government’s weapons programs. The mill circuits were continually improved

to meet product demand and the “ B-Plant” was constructed in 1955. The B-PLANT was located on a

bench on Club Mesa several hundred feet above the San Miguel River. Uranium was recovered from the

leach liquors with a column ion-exchange process, followed by precipitation and drying of the yellow cake.

Tailings from B-Plant were placed in piles on a bench of Club Mesa. A radium removal circuit was installed

in 1958 to treat waste solutions. Three unlined Club Ranch Ponds were constructed between 1963 and

1965 to aid liquid disposal through a combination of evaporation and seepage. Additional liquid waste

disposal improvements added later included the addition of a neutralization circuit to permit part of the

wastes to be discharged to the San Miguel River and the installation of a spray evaporation system in 1976

on Club Mesa. Between 1936 and 1984, when Union Carbide and Carbon Corporation operated the mill

complex, approximately 42 million pounds of uranium and 222 million pounds of vanadium were produced.

Umetco Minerals Corporation (Umetco), a subsidiary of Union Carbide, has operated the facility since its

closure in 1984.

The State of Colorado (State) filed a natural resources damages claim against Union Carbide and Carbon

Corporation and Umetco in December, 1983 under CERCLA. The Uravan site was proposed to the

National Priorities List (NPL) on October 15, 1984, and was finalized on the NPL on June 10, 1986.

In 1985, the State and Umetco began discussions regarding remedial activities to be conducted at the

Uravan site. In 1987, these discussions resulted in the preparation of a Consent Decree and associated

Remedial Action Plan (RAP). The RAP is the functional equivalent of an EPA Record of Decision (ROD)

and Remedial Investigation/Feasibility Study (RI/FS). The United States District Court for the District of

Colorado approved the Consent Decree and RAP on February 12, 1987.

Under this agreement, Umetco is required to complete the following general remedial activities specified

in the RAP:


• Reshaping the 10 million cubic yard tailings repositories and constructing a long-term containment

cover and appropriate drainage controls

• Relocating 1.5 million cubic yards of mill wastes, including evaporative crystals and wastewater

treatment sludges, to a secure on-site repository and constructing long-term containment controls

• Cleanup of dispersed soils

• Decommissioning and demolition of the milling facilities

• Remediation of ground water resources.

Photo 2-1 is an areal photograph of the Uravan Superfund site in of July 1989. Photo 2-2 shows the site

as of August 1997.

3.0 REGULATORY COMPLIANCE

Consistent with Section 121 of CERCLA, as amended, and Section 300.430 (f) of the NCP, the EPA is

performing the Five-Year Review for the Umetco Minerals Corporation Uravan Superfund Site. EPA

determined the level of review based on site-specific considerations including the nature of the response

action, the status of the onsite response activities, proximity to populated areas and sensitive environments,

and the interval since the last review was conducted. In most cases, EPA performs a Level I analysis for

the Five-Year Review. Level I is the lowest level of evaluation of protectiveness. Based on the guidance

documents, a Level I Five-Year Review was performed of the Umetco Minerals Corporation Uravan

Superfund Site. The components of a Level I Five-Year Review, as suggested by EPA guidance (EPA,

1991; EPA, 1994a, EPA 1995a), include:

• Review of documented operation and maintenance of the site

• Performance of a limited site visit

• Limited analysis of site conditions

• Review of the administrative record


• Review of Federal and State environmental laws cited in the RODs (i.e., Consent Decree and

RAP) to determine if they remain applicable or relevant and appropriate requirements (ARARs).

3.1 Statutory Review

A statutory five-year review is required at any site where unlimited use and unrestricted exposure, based

on ROD (i.e., federal equivalent of Colorado’s Consent Decree and RAP) cleanup levels, have not been

attained. A Five-Year Review is required no less than every five years after initiation of the selected

remedial action. In 1994, EPA issued a 1993 Five-Year Review for the Umetco Minerals Corporation

Uravan Superfund Site for the period 1988 through December 1993 and completed the current review in

October 1999. Another Five-Year Review will be conducted in 2004 or earlier unless existing onsite

contamination is removed to allow unrestricted access and unlimited use of the property. This document

presents the results of the 1999 review.

3.2 ARARs

The Consent Decree for Civil Action No. 83-C-2384 for the State v. UCC and Umetco and the RAP

were reviewed for this Level I Five-Year Review. Applicable or Relevant and Appropriate Requirements

(ARARs) discussed in these documents are presented below. The current status of each ARAR is noted.

The most recent version of Colorado and Federal regulatory codes as available through the Internet were

consulted for changes to Applicable or Relevant and Appropriate Requirements (ARAR) standards. Table

3.2-1 presents the ARARs as invoked in the Consent Decree and RAP, and the current status of those

standards. Based on this review, the Uravan Site meets current ARARs.

As stated in the Five-Year Review conducted in 1997, some changes were made to the Colorado Rules

and Regulations Pertaining to Radiation Control, 1990 as amended in Part 4. These standards apply to

public dose limits. Additionally 10 Code of Federal Regulations (CFR) Part 20 became effective in

Colorado in January 1994, which also specifies public dose limits due to airborne radioactive effluents to

the environment. Since 1997 there have been no changes to the ARARs for the Uravan Site.


Table 3.2-1ARARs Status

Regulatory Source Standard Status

40 CFR§192, Subpart D Soil Criteria: 5 pCi/g Ra226 above background in soil No change.

0 - 15 cm BGS

15 pCi/g Ra226 above background in soil > 15 cm

BGS, averaged in 15 cm thick layers (Table 4.1.2-1

RAP)

40 CFR§192.32(a)(2) Ground Water Quality Protection Standards (Table No change.

5.4.3.2-2 RAP)

10 CFR 20 Occupational air exposure No change.

6 C.C.R. 1007 -1 Part 4 Radiation Protection Program No change.

6 C.C.R. 1007 -1 Part 18, Airborne Effluent ALARA No change.

Criterion 8

6 C.C.R. 1007 -1 Part 17 Transportation of Radioactive Materials No change.

1. CFR: Code of Federal Regulations2. CCR: Code of Colorado Regulations


4.0 DESCRIPTIONS OF REMEDIAL ACTIONS AT SPECIFIED AREAS

4.1 Atkinson Creek Crystal Disposal Area

4.1.1 History

The Atkinson Creek Crystal Disposal Area, Figure 2-3, was located downstream from the Club Ranch

Ponds and adjacent to Atkinson Creek. This disposal area was constructed in the early 1970s on the site

of a former mobile home park. The mobile homes were removed and the underlying soils were excavated

and stockpiled adjacent to the area. After preparation of the site, approximately 200,000 cubic yards of

raffinate crystals from Club Ranch Ponds #1 and #6 were removed and stored in the area. No liner was

placed beneath the crystals to prevent contamination of the underlying soils or ground water. Natural soils

were then placed on the raffinate crystals to form a soil cover approximately twelve inches thick.

4.1.2 Remedial Objectives

In the RAP, the State selected excavation and on-site disposal of raffinate crystals in the Burbank Quarry,

an approved raffinate crystal storage area, and disposal of other contaminated solids in the Tailings Piles

on Club Mesa as the remedy for the Atkinson Creek Disposal Area. The objectives of this remedy were

to remove the source of potential future ground and surface water contamination by raffinate crystal

dissolution or erosion.

4.1.3 Site Status and RAP Requirements

4.1.3.1 Status December 1993 (Excerpted from EPA 1993 Five Year Review, Umetco 1997 Five

Year Review, Colorado Department of Public Health and Environment (CDPHE) 1999 Uravan Remedial

Action Plan Status Report)

Initial removal of the crystals started in the spring of 1991 and continued until mid-summer of 1991.

Radiation and soil sampling surveys were conducted in late 1991. Soil concentrations of arsenic,

molybdenum, thorium-230, and vanadium were found to exceed the “No Further Action” criterion for soils

in a small percentage of the area. Umetco evaluated the health risk of the residual contaminants using

three different exposure scenarios. The Colorado Department of Public Health and the

Environment evaluated the risk assessment and found there was not significant health risk to the public

posed by the residual contaminants so long as the area was covered by one foot of clean


soil. The RAP called for initial removal of crystals to be completed by December 31, 1992. Umetco

requested a RAP modification to this date since the results of the risk assessment were still outstanding.

Final reclamation was completed as required by the new date of December 31, 1993.

4.1.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, 1999 CDPHE

Uravan Remedial Action Plan Status Report)

No further activity was undertaken at this site since the last Five-Year Review was prepared. Umetco is

currently conducting performance monitoring of this site as required by the RAP. Although required by the

RAP, a Final Construction Report has not yet been submitted to the State.

Remedial action at this site is 100 percent complete as of October 14, 1999

Table 4.1.3-1 summarizes the major requirements for remedial activities at the Atkinson Creek Disposal

Area specified in Section 4.1.2 of the RAP, required completion dates as specified in Section 4.1.4 of the

RAP, and status as of October 14, 1999.

4.1.4 Summary of Site Visit Observations and Findings

The on-site visits of October 13 and 14, 1999 found the Atkinson Creek Disposal Area to be visually

restored as compared to the surrounding areas not included in the Atkinson Creek Disposal Area. Crystals,

discoloration, or other overt signs of contamination were not observed in this area. Visible signs of severe

erosion were also not observed. Vegetation had re-established itself and visually appeared to be very

healthy.

4.1.5 Photographs

Photos 4.1-1 and 4.1.2 illustrate the current status of the Atkinson Creek Disposal Area, showing

re-establishment of healthy-looking vegetation.

Recommendations:

1 . A Final Construction Report for the Atkinson Creek Disposal Area should be submitted to the

State as soon as possible.


Table 4.1.3-1

Atkinson Creek Disposal Area

RAP Requirements Required Date of Site Status 10/14/99

Completion Remedial Actions At This Site Complete as of

10/14/99

1. Raffinate crystals and cover soils shall be excavated

and removed from the Atkinson Creek Disposal

Area.

These materials shall be placed, compacted, and

disposed in the secure crystal repository, the

Burbank Quarry in accordance with the Approved

Final Plans and Specifications.

12/31/92

Note: RAP modified so

that completion date

was 12/31/93

Completed as required by 12/31/93

Approximately 200,000 cubic yards of raffinate

crystals and cover soils were excavated and

removed from the Atkinson Creek Disposal

Area and placed in the Lower Burbank

Repository.

2. After crystal removal, peripheral contaminated soils

and the contaminated soils beneath the crystals shall

be excavated, placed, compacted, and disposed on

the tops of the Tailings Piles on Club Mesa in

accordance with the Approved Final Plans and

Specifications.

12/31/92


that completion date

was 12/31/93


All contaminated soils were excavated, placed,

compacted and disposed on top of Tailings Pile

#1-2.

3. Completion of contaminated soil removal shall be

based upon specified criteria. If sandstone or

siltstone bedrock or the water is encountered, soil

sampling is not required.

12/31/92

Note: RAP modified so that completion datewas 12/31/93


Risk assessment for arsenic, molybdenum,

thorium-230, and vanadium concentrations

above cleanup levels specified in RAP indicated

no significant health risks posed by materials

remaining beneath one foot of soil. Agreed to

by State.


Table 4.1.3-1


RAP Requirements Required Date of

Completion

Site Status 10/14/99

Remedial Actions At This Site Complete as of

10/14/99

4. During remedial activities, runoff controls shall be

in place to prevent releases of hazardous materials.

12/31/92


that completion date was

12/31/93

Not discussed in documents reviewed during this

Five-Year Review

5. Atkinson Creek Disposal Area shall be graded to

contours that provide a stable ground surface

configuration consistent with long-term stability and

erosion resistance of the area.

12/31/92



12/31/93


Area was graded to match surrounding contours.

6. Graded area shall be covered with at least one foot

of random fill and revegetated.

12/31/92



12/31/93


The Atkinson Creek Area was covered with a

minimum of one foot of random fill and

revegetated.


Table 4.1.3-1




10/14/99

7. If monitoring of the cover and vegetation

performance, after completion of remedial

activities but prior to closure of the Uravan

Facility demonstrates that performance

requirements as stated in the Quality Plan have not

been met, Umetco shall implement additional

State-approved remedial activities to achieve

required performance.

As required Has not been required to-date by the State.

8. Restoration of the underlying aquifer shall be in

accordance with Section 5.0 of the RAP.

Not specified in the RAP Has not been required to-date by the State.

9. A Final Construction Report shall be submitted to

the State.

Not later than ninety (90)

days after the completion

of initial vegetation.

NOT COMPLETED AS REQUIRED BY RAP

A Final Construction Report was prepared but

was not submitted to the State.

10. A Certification Report shall be submitted to the

State.

Not later than 120 days

after completion of all

remediation activities at

the Uravan site

Not required as of 10/14/99

All remediation activities at the Uravan site have

not been completed.


Table 4.1.3-1




10/14/99

11. Long-term monitoring and maintenance of the

surface configuration and vegetation after closure

of the Uravan Facility shall be conducted pursuant

to the Colorado Radioactive Materials License.

After closure of Uravan

facility

Ongoing

Monitoring and maintenance requirements

specified in the Radioactive Materials License.


4.2 Club Ranch Ponds Area

4.2.1 History

The Club Ranch Ponds Area consisted of six unlined liquid waste disposal ponds located down valley from

the Uravan Mill site and ancillary disposal areas, as shown in Figures 2-2, 2-3, and 4-1. The Club Ranch

Evaporation Ponds were constructed in the early 1960s to serve as both evaporative and seepage

discharge ponds. The ponds were excavated into gravely terrace deposits of the San Miguel River. The

depths of the ponds ranged from approximately eight feet to almost thirty feet. Umetco estimated that the

ponds contained approximately 560,000 cubic yards of raffinate crystals and 30 million gallons of liquid.

Contaminants were identified in the alluvial gravels and underlying Kayenta Formation. It was thought that

the majority of the radionuclide contaminants were trapped in the material directly beneath the ponds. There

was also evidence of seepage into the San Miguel River along the pond, in the form of crystals, as shown

in Photo 4.2-6 taken in June 1987.


In the RAP, the State selected excavation and on-site disposal of raffinate crystals in the Burbank Quarry,

an approved raffinate crystal storage area, and disposal of other contaminated solids in the Tailings Piles

on Club Mesa as the remedy for the Club Ranch Evaporation Ponds Area. The objectives of this remedy

were to remove the source of potential future contamination of the Kayenta-Wingate aquifer and the San

Miguel River.



Year Review, CDPHE 1999 Uravan Remedial Action Plan Status Report)

New evaporation ponds, called the Club Ranch Evaporation Ponds # 7 and #8, were constructed in the

fall of 1987 and spring of 1988 in order to contain hillside seepage liquids and to contain liquids transferred

from the old, unlined Club Ranch Evaporation Ponds. These ponds were constructed in conformance with

state and federal requirements in order to preclude discharge of mill related liquids. The liquids remaining

in the unlined Club Ranch Evaporation Ponds were transferred into Club Ranch Evaporation Ponds #7 and

#8 in 1988.


Initial removal of the crystals in the unlined Club Ranch Evaporation Ponds commenced during the fall of

1989. Approximately 550,000 cubic yards of deposits were removed by mid-1991. The RAP also called

for reconstruction of all ponds by December 31, 1991. Umetco requested and was granted a modification

to this date in order to perform phased reconstruction of the ponds. Phased reconstruction would permit

the ponds to be built on an as-needed basis. Three lined ponds, Club Ranch Evaporation Ponds #1, # 4,

and #6 were reconstructed during late 1991 and 1992.

Reconstruction of all ponds was 80 percent complete as of December 1993.

During initial crystal removal and pond reconstruction, contaminated ground water was encountered in the

alluvial materials on top of the bedrock beneath the unlined Club Ranch Evaporation Ponds. This ground

water was intercepted and placed in Club Ranch Evaporation Ponds #7 and #8. Final reclamation of this

area will be undertaken after completion of the valley ground water cleanup.

4.2.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, CDPHE 1999


Reconstruction of lined Club Ranch Evaporation Ponds #1, #4, and #6 is 100 percent

complete as of October 14, 1999.

In 1997, 20 exploration trenches were excavated through the shallow alluvium material in the lower unlined

Club Ranch Evaporation Ponds #2, #3, and #5. Liquid believed to be either contaminated perched ground

water or residual seepage from the ponds was collected in these trenches and pumped into the lined Club

Ranch Ponds for evaporation. Approximately 1.6 million gallons of perched ground water was transferred

from the trenches in the unlined ponds to the lined ponds by the end of the third quarter 1999.

Removal of additional contaminated soils and other materials from the area of the lower unlined Club Ranch

Evaporation Ponds # 2, #3, and #5, was performed in 1998. Excavation continued until the underlying

bedrock was encountered. This action removed the final significant source of contamination from the Club

Ranch Evaporation Ponds Area. Dikes around these ponds were permitted to remain in place to collect

precipitation that is collected in dewatering points, e.g., trenches in the shallow alluvium, and immediately

transferred to the lined Club Ranch Evaporation Ponds. Final removal of all contaminated soils will be

undertaken during the phased removal of the lined Club Ranch Evaporation Ponds that will commence

following completion of the ground water remediation program in approximately 2003.


The synthetic liner of Pond #8 was replaced in 1994. Minor maintenance to the liners of the lined Club

Ranch Evaporation Ponds were undertaken during the period of 1993 through 1999. The purpose of this

maintenance was to repair minor tears or holes in the liners. New probes and alarm system were also

installed in Club Ranch Evaporation Pond #7 in 1998.

In 1999, the site installed a manually operated enhanced evaporation pilot system in Club Ranch Pond #8

to determine whether water pumped through spray heads would result in a significant increase in water

evaporation. This pilot system consists of eight double-head sprays, although the State currently permits

the use of only four of the double-head sprays. According to Umetco site personnel, operation of the

system has resulted in an increased evaporation rate from 1 gallon/minute/acre to approximately 2

gallons/minute/acre. Club Ranch Pond #8 is approximately 7 acres in size, so approximately 14 gallons of

water are evaporated from this pond every minute. Umetco expects to request the State in calendar year

2000 to permit the use of the additional heads in the pilot program, and possibly expand the system’s use

to the other ponds. If this system proves effective, the amount of time required to evaporate the Club Ranch

Evaporation Ponds’ liquids at the end of site remediation and shutdown of the ground water remediation

program may be significantly reduced.

Table 4.2.3-1 summarizes the major requirements for remedial activities at the Club Ranch Evaporation

Ponds Area specified in Section 4.2.2 of the RAP, required completion dates as specified in Section 4.2.4

of the RAP, and status as of October 14, 1999.


During the site visit on October 13 and 14, 1999, the five lined Club Ranch Evaporation Ponds, #1, #4,

#6, #7, and #8, visually appeared to be in good condition and no visible defects in the liners were evident.

According to site personnel, none of the ponds had ever experienced a contaminant effluent rate exceeding

the permissible value of 5 gallons per minute that would require activation of the Liner Failure Contingency

Plan. In addition, site personnel reported that none of the lined Club Ranch Evaporation Ponds had ever

overflowed or otherwise released water to the San Miguel River.

Ground water pumped into the lined Club Ranch Evaporation Ponds has resulted in small amounts of

raffinate crystal growth on the liners, especially on Club Ranch Evaporation Ponds #1,# 4, and #6. A

white-looking material, visually similar to raffinate crystals, was observed along the east side of the San

Miguel River directly below the old unlined Club Ranch Evaporation Ponds. This


material is in the same area on the San Miguel River as the raffinate crystals shown in Photo 4.2-6 which

was taken in June 1987.

The enhanced evaporation system was observed in Club Ranch Evaporation Pond #8. Four of the eight

double-spray heads were in operation throughout the visit.

4.2.5 Photographs

Photos 4.2-1 and 4.2-2 illustrate the unlined Club Ranch Evaporation Ponds as they existed in May 1989.

Large volumes of raffinate crystals are observed in these photographs. Photo 4.2-3 illustrates the status of

the Club Ranch Evaporation Ponds as of October 1999. Photo 4.2-4 shows the enhanced evaporation

pilot system consisting of eight double spray heads, with four of the double spray-heads in operation. Small

volumes of crystals forming in the new lined Club Ranch Evaporation Ponds can be seen in Photo 4.2-5.

Recommendations:

1. Additional studies should be undertaken of the banks of the San Miguel River where raffinate

crystals appear to still be located. The studies should confirm that this material either is or is not

comprised of raffinate crystals or crystal residue. If the material is found to be of raffinate crystal

origin, an assessment should be initiated to determine the potential risk of leaving these materials

in place until the final reclamation of this area is undertaken.


Table 4.2.3-1Club Ranch Ponds Area


Completion


1. All liquids shall be evaporated in place.

Raffinate crystals removed in order to construct

evaporation ponds for hillside seepage, toe berm

seepage and tailings liquid may be temporarily

stored on Club Mesa, existing unlined Club

Ranch Ponds, or in another disposal area

approved by the State.

These materials shall be removed and finallydisposed in the secure crystal repository, the

Burbank Quarry.

12/31/88

12/31/91

12/31/91

Completed - Liquids transferred to Ponds 7 &

8 by 12/31/.88

Completed by 12/31/91.


2. After removal of the raffinate crystals

contaminated soils surrounding the Club Ranch

Ponds and the contaminated soils beneath the

crystals shall be excavated, placed, compacted,

and disposed on the tops of the Tailings Piles on

Club Mesa in accordance with the Approved

Final Plans and Specifications.

12/31/91 Completed by 12/31/91.

All contaminated soils were excavated and

placed on top of Tailings Pile #1-2 and

compacted.

3. After excavation of contaminated soils,

scintillometer surveys and soil assays for

radionuclides and heavy metals to ascertain

residual contamination levels shall be conducted.

12/31/91 Completed by 12/31/91.


Table 4.2.3-1

Club Ranch Ponds Area


Completion


4. Uncontaminated materials remaining in the pond

dikes may be used to grade the site after removal

of raffinate crystals and contaminated soils.

12/31/91

Permit modified to permit

completion by 12/31/92


5. Any area not used as a site for the evaporation of

liquids shall be reclaimed in accordance with

specified procedures.

Not specified in RAP Completed.

The area was graded to match surrounding

contours.

6. Evaporation pond areas shall be reclaimedimmediately upon closure of the evaporation

ponds in accordance with the specified manner.

Upon closure of Ponds Not Completed.

The area will be reclaimed upon completion of

the ground water extraction program and

closure of the Ponds.

7. Reclamation of any part of the Club Ranch PondsArea shall be governed by specified procedures.

Not specified in RAP Not Completed.

The area will be reclaimed upon completion of

the ground water extraction program and

closure of Ponds.


Table 4.2.3-1Club Ranch Ponds Area


Completion


8. If monitoring of the cover and vegetation

performance, after completion of remedial activitiesbut prior to closure of the Uravan Facility

demonstrates that performance requirements as stated

in the Quality Plan have not been met, Umetco shall

implement additional State-approved remedial

activities to achieve required performance.

As required Not Required as of 10/14/99.

Final reclamation of this area will be not be

completed until the five lined Club Ranch Area

Ponds and all underlying contaminated soils are

removed and placed into the B-Plant

Repository. This will not occur until ground

water extraction activities stop in approximately

2003. 9. New evaporation ponds shall be designed,

constructed, and installed in accordance with 40 CFR

192.32(a)(1) to prevent the migration of any

hazardous constituents into adjacent subsurface soil,

ground water, or surface water during their

operational life. Each pond shall have a synthetic

liner placed upon a clay foundation or base. The

pond freeboard, dike, and capacity design shall be

based upon the greatest amount of annual rainfall

expected for one year out of 25 and the annual

evaporation rate used shall be the annual rate

expected for nine years out of ten. The design shall

include a seepage/leak detection system. A ground

water monitoring program shall be designed and

initiated, and shall include action levels for response.

12/31/91

Note: RAP modified

to permit completion

by 12/31/92

Construction of Ponds #7 and #8 completed

by 12/31/88, Ponds #1, #4, #6 completed by

12/31/92.

Initial monitoring of ground water wells

began in 1991 and 1992.


Table 4.2.3-1

Club Ranch Ponds Area

RAP Requirements Required Date ofCompletion


10. Restoration of the underlying aquifer shall be

in accordance with Section 5.0 of the RAP.Not specified in theRAP

Ongoing as of 10/14/99.

11. A Final Construction Report shall be

submitted to the State.Not later than ninety(90) days after thecompletion of initialvegetation.

Not Required as of 10/14/99.

Final reclamation of this area will be not be completeduntil the five lined Club Ranch Area Ponds and allunderlying contaminated soils are removed and placedinto the B-Plant Repository. This will not occur untilground water extraction activities stop inapproximately 2003.

12. A Certification Report shall be submitted tothe State.

Not later than 120days after completionof all remediationactivities at theUravan site


All remediation activities at the Uravan site have notbeen completed.

13. Long-term monitoring and maintenance ofthe surface configuration and vegetation afterclosure of the Uravan Facility shall beconducted pursuant to the ColoradoRadioactive Materials License.

After closure,ofUravan facility

Ongoing.


4.3 River Ponds Area

4.3.1 History

The River Ponds Area, Figure 2-2, consisted of seven small ponds constructed along the San Miguel River

adjacent to the mill. Five of the ponds were located on the mill side (south side) of the river and two ponds

were located on the north side of the river adjacent to Highway 141. These ponds were constructed within

old tailings piles by excavating into and, in some cases, through the tailings. The exposed surfaces of the

excavations were then mantled with natural soils. The five ponds on the mill side of the river were used as

settling basins for liquids collected within the mill area and stored there prior to discharge into the river. The

two ponds on the north side of the river were used to clarify treated process liquors prior to discharge.

These ponds contain neutralized sludge from the clarification operation. Umetco estimated that about

200,000 cubic yards of mill wastes and contaminated soils were contained in the River Ponds Area.

Seepage of liquids from the River Ponds Area to the ground water, and eventually to the San Miguel River,

was estimated at 10 to 40 gallons per minute when they were in use.


In the RAP, the State selected excavation of all sludge and tailings and on-site disposal in the Tailings Piles

on Club Mesa as the remedy for the River Ponds Area. The objectives of this remedy were to remove the

source of potential future contamination of the ground water and the San Miguel River.




Initial removal of the ponds started in late 1998 and was completed in mid-1989. These materials were

placed into Trailing Piles #1-2 and #3. Excavation was completed down to the water table. Umetco

subsequently constructed rock berms to trap sediment carried by the San Miguel River during high flows.

Vegetation has re-established itself at this site. The RAP called for final reclamation by December 31,

1991. A Final Construction Report was submitted to the State and approved in mid-1993.


This component was 100 percent complete as of December 1993.



No further activity has been undertaken at this site since the last Five-Year Review was prepared. Umetco

is currently conducting performance monitoring of this site as required by the RAP.

Remedial action at this site is 100 percent complete as of October 14, 1999.

Table 4.3.3-1 summarizes the major requirements for remedial activities at the River Ponds Area specified

in Section 4.3.2 of the RAP, required completion dates as specified in Section 4.3.4 of the RAP, and status

as of October 14, 1999.


Visual observations during the on-site visits of October 13 and 14, 1999 found the River Ponds Area to

be restored to a condition comparable to surrounding areas not included in the River Ponds Area. The San

Miguel River has incorporated the River Ponds Area into its course. Vegetation had reestablished itself

and visually appeared to be very healthy. Tailings, discoloration, or other overt signs of contamination were

not found during visual observation of this area.

4.3.5 Photographs

Photo 4.3-1 shows the River Ponds Area being remediated in May 1989, while Photo 4.3-2 shows the

River Ponds Area cleanup complete in July 1989. Photo 4.3-3 illustrates the current status of the River

Ponds Area as of October 1999.

Recommendations:

1. None noted


Table 4.3.3-1

River Ponds Area


Completion


Remedial Action at This Site 100% Completed as

of 10/14/99

1. All liquids from the River Ponds shall be

removed.

12/31/87 Completed - No information available for review

as to actual completion date

Tailings, neutralized sludge, and contaminated

soils shall be removed, placed, compacted, and

disposed on the tops of the Tailings Piles on

Club Mesa in accordance with the Approved

Final Plans and Specifications

12/31/90 Completed by mid-1989.

Approximately 290,000 cubic yards of tailings,

sludge, and soils were placed in Tailings Piles #1-2

and 3.

2. Excavation of contaminated materials until:

- At least one foot of material is removed and

scintillation measurements are less than 30

FR/hr; or- Sandstone or silstone bedrock or the water

table is encountered.


Excavation continued until ground water was

encountered at the approximate elevation of low

winter flows in the San Miguel River.

3. After excavation of contaminated soils,

scintillometer surveys and soil assays for

radionuclides and heavy metals to ascertain

residual contamination levels shall be conducted

unless sandstone or siltstone bedrock or the

water table is encountered.


Excavation continued until ground water was

encountered at the approximate elevation of low

winter flows in the San Miguel River


Table 4.3.3-1

River Ponds Area


Completion



of 10/14/99

4. Runoff controls shall be in place to prevent

releases of hazardous materials.

12/30/90 Not discussed in documents reviewed during this

Five-Year Review.

5. The River Ponds Area shall be regarded to

contours that provide a stable ground surface

configuration consistent with the global of long-

term stability and erosion resistance of the area.

12/31/91 Not Required.

Regrading, filling, and vegetation was not required

as excavation removed materials below the average

flow level of the San Miguel River.

6. The River Ponds Area shall be covered with at

least one (1) foot of random fill and shall be

vegetated.

12/31/91 Not Required.

Regarding, filling, and vegetation was not required

as excavation removed materials below the average

flow level of the San Miguel River. Rock berms

were constructed across the excavated areas to

reduce river flow velocities and trap sediment

carried by the river during high flows. Riparian

vegetation re-established itself naturally in the

River Ponds Area.


Table 4.3.3-1River Ponds Area


Completion



of 10/14/997. Regrading, filling, and vegetation shall not be

required if excavation has removed materials

below the average flow level of the San Miguel

River.

12/31/91 Not required.

Regrading, filling, and vegetation was not required

because excavation removed materials below the

average flow level of the San Miguel River. Rock

berms were constructed across the excavated areas

to reduce river flow velocities and trap sediment

carried by the river during high flows. Riparian

vegetation re-established itself naturally in the

River Ponds Area.8. If monitoring of the cover and vegetation




requirements as stated in the Quality Plan have

not been met, Umetco shall implement

additional State-approved remedial activities to

achieve required performance.

As required Not required by the State as of 10/14/99.

9. Final Construction Report shall be submitted to

the State.

No later than ninety (90)

days after the completion

of remedial activities at

the River Ponds Area

Completed.

Submitted to the State and approved in mid-1993


Table 4.3.3-1

River Ponds Area


Completion



of 10/14/99

10. A Certification Report shall be submitted. No later than 120 days

after completion of all

remediation activities at

the Uravan site

Not required as of 10/14/99.

All remediation activities at the Uravan site have

not been completed

11. Long-term monitoring and maintenance of

the surface configuration and vegetation

after closure of the Uravan Facility shall be

conducted pursuant to the Colorado

Radioactive Materials License.

After closure of Uravan

facility

Ongoing.


4.4 Club Mesa Tailings Piles

4.4.1 History

The Club Mesa Tailings Piles at Uravan were started in the mid-1950s to store tailings generated by the

Uravan Mill. The Tailings Piles are located on Club Mesa above the Mill Site, as shown in Figures 2-2 and

2-3. The Club Mesa Tailings Piles were constructed using the upstream method whereby the tailings slurry

was pumped from the mill to the Tailings Piles and deposited through spigots placed along the tailings

delivery line. The embankment raises are constructed from tailings sand that were regraded, placed, and

compacted.

Prior to 1980, the downstream slopes on the tailings embankments varied from approximately 1.5 (H) to

1 (V) to 3 (H) to 1 (V). As the height of the embankments increased, there was concern for the stability

of the embankments. Consequently, in 1980, rock fill berms including a drainage blanket for seepage

control were constructed to buttress the lower portions of the Tailings Piles. Horizontal drains to promote

drainage of the tailings were also installed but were ineffective.

Observed impacts from the existing tailings disposal system included seepage of contaminated liquids into

the Club Mesa bedrock; erosion and transport of tailings material away from the disposal area by wind and

water action; and radon emanation from the Tailings Piles.


In the RAP, the State selected cessation of discharge to the Tailings Piles, removal of liquids, and the

covering of the slopes of the Tailings Piles material prior to final reclamation as the remedy for the Tailings

Piles. The objectives of this remedy were to minimize surface water infiltration, seepage from the Tailings

Piles, wind and water erosion, and radon emanation from the Tailings Piles.





The RAP called for six remedial action components: (1) dewatering; (2) sloping and contouring; (3)

constructing rock fill buttress and toe drain; (4) constructing side slope protective cover; (5) placing top

covers; and (6) constructing drainage diversion.

Tailings Pile #3

Components 1 through 4 were completed as of December 1993. The top cover, except for riprap, had

been placed on Tailings Pile #3. A portion of the diversion channel system had been constructed.

Component 5 was 45 percent complete and Component 6 was 20 percent complete as of December

1993.

Tailings Pile #1-2

The top of Tailings Pile #1-2 will act as the final repository for tailings and contaminated soils from valley

areas and Club Mesa. All remaining tailings, soils, and liner materials from the final cleanup of the Club

Ranch Evaporation Ponds will go to Tailings Pile #1-2. The placement of contaminated soils and other

materials on Tailings Pile #1-2 was approximately 90 percent complete as of December 1993.

Completion of the top slope cover for Tailings Pile #1-2 was scheduled for completion by December 31,

1996. Diversion channels were also scheduled for completion by December 31, 1995. It was thought that

a small cell would need to be kept open to accept contaminated materials from the final reclamation of the

Club Ranch Evaporation Ponds.

The entire tailings pile project was 96 percent complete as of December 1993.



Tailings Pile #3

Components 1 through 4, as described above, are 100 percent completed. The entire first two layers

of the top cover, e.g., the clay radon barrier and the clay frost barrier have been placed. The riprap armor

barrier has yet to be placed on Tailings Pile #3. A portion of the diversion channel has been constructed.

Placement of the top cover is 85 percent complete and drainage diversion construction is 20

percent complete as of October 14, 1999.

In late 1993, a joint separation was identified at the northeast side of Tailings Pile #3, Figure 7.4.4-1. The

joint separation is approximately 80 to 100 feet long and occurs at the north cliff in a near


vertical rock face against which the tailings and overlying fill materials were placed. The depth of the

separation varies from approximately five to sixteen feet. Umetco has conducted several studies of this joint

separation and has determined that the joint separation is due to differential settling in an isolated area. In

1998, a detailed geotechnical investigation of the joint separation was conducted. As part of the

investigation, ten exploratory borings were completed. Nine inclinometers and seven nested pneumatic

piezometers were installed in seven of the borings completed in the tailings pile. The other three borings

were completed in the sandstone abutment above the tailings pile. Umetco does not expect the separation

to spread any further than its present state. According to Umetco personnel, they have completed studying

remedial alternatives and will submit a final remedial action plan to the State for approval in the near future,

although this date was not specified. The final remedial action plan had not been received by the State as

of October 14, 1999.

Tailings Pile #1-2

The top of Tailings Pile #1-2 acted as the final repository for tailings and contaminated soils from valley

areas and Club Mesa. The capacity of Tailings Pile #1-2 has been met. All remaining tailings, soils and liner

materials from the final cleanup of the Club Ranch Evaporation Ponds will go to the new B-Plant

Repository.

The placement of contaminated soils and other materials on Tailings Pile #1-2 is 100 percent

complete.

Completion of the top slope cover for Tailings Pile #1-2 is scheduled for completion by December 31,

2002. This will allow Umteco to ensure that Tailings Pile #1-2 settlement and compaction has completed

before they place the final cover. Diversion channels are also scheduled for completion by December 31,

2002. Contaminated materials removed during the final reclamation of the Club Ranch Evaporation Ponds

will be placed in the new B-Plant Repository as will any other contaminated materials removed during the

remainder of remedial actions at the Uravan facility, e.g., windblown materials.

The entire tailings pile project is 98 percent complete. The initial construction of the B-Plant

Repository is 100 percent complete.

An area of ground water seepage was identified during a State inspection conducted in early October

1999. This area was located approximately midway along the west side of the tailings pile, abutting the

adjoining mesa. It initially appeared to be a small area of differential settling. However, when this area was

excavated to a depth of approximately 8 to 10 feet, approximately 30 gallons per


minute of ground water flowed out of several cracks in the mesa’s sidewall. According to Umetco

personnel, this area had never experienced ground water seepage throughout the working life of the tailings

pile. However, precipitation during the summer of 1999 was very high, and this could be the cause of the

seepage this year. The area on top of the mesa immediately adjacent to the west side of Tailings Pile #1-2

is part of the Club Mesa Area that has been completely remediated. A clay lined diversion ditch situated

on Club Mesa along the west side of Tailings Pile #1-2 should divert surface water runoff away from the

Tailings Pile and also minimize the potential for surface water infiltration into Tailings Pile #1-2. Umetco is

currently planning to investigate this situation in the near future to identify the source of the seepage and

appropriate mitigation measures.

Table 4.4.3-1 summarizes the major requirements for remedial activities at the Club Mesa Tailings Piles

specified in Section 4.4.2 of the RAP, required completion dates as specified in Section 4.4.4 of the RAP,

and status as of October 14, 1999.


Tailings Pile #3

Tailings Pile #3 is closed and no longer receiving wastes. Sparse vegetation is growing on top of the clay

frost barrier. The riprap armor has not been placed on the top of the pile. The top berm of the pile has a

slope of approximately 5(H):1(V) as required by the RAP. The lower parts of the tailings pile berm have

been sloped to approximately 3(H):1(V) and have received the final cover materials, including riprap. All

surface water controls, diversion ditches, toe berms, sumps, and other flow control measures were in place,

operating, and in conformance with RAP specifications. Riprap was in place on the south and east sides

of the pile. The joint separation was viewed during the site visit. What appeared to be a new crack adjacent

to the joint separation was observed. However, this new crack is probably only part of the overall joint

separation existing in this area.

Tailings Pile #1-2

Tailings Pile #1-2 is no longer receiving wastes. None of the components of the final cover, e.g., clay radon

barrier, clay frost barrier, or riprap armor, have been placed on top of Tailings Pile #1-2. The surface has

been graded for runoff. The top berm of the pile has a slope of approximately 5(H):1(V) as required by

the RAP. The lower parts of the tailings pile berm have been sloped to approximately 3(H):1(V) and have

received the final cover materials, including riprap. All surface water controls, toe berms, sumps, and other

flow control measures were in place, operating, and in conformance with RAP specifications.


The ground water seepage identified during the State October 1999 inspection was viewed during this

audit. The entire area was very wet, but it appeared that the ground water seep had slowed to a rate of

approximately 5 gallons per minute exiting through five primary points in the rock wall. Water collected in

a sump excavated around these points did not require pumping during the audit.

4.4.5 Photographs

Photos 4.4-1 and 4.4-2 show regrading and contouring of Tailings Pile #1-2 in May 1989. Photo 4.4-3

shows the top of Tailings Pile #3 as of October 1999. Photos 4.4-4 and 4.4-5 show the joint separation

in Tailings Pile #3 as of October 1999. Photo 4.4-6 shows the status of the Tailings Pile #1-2 as of

October 1999. Photo 4.4-7 shows the diversion ditch on top of Tailings Pile #1-2 as of October 1999.

Photo 4.4-8 shows the south slope of Tailings Pile #1-2 as of October 1999. Photos 4.4-9 and 4.4-10

show the ground water seepage in Tailings Pile #1-2 as of October 1999.

Recommendations:

1. Tailings Pile #3

- Although the joint separation does not appear to negatively effect the overall stability of Tailings

Pile #3, this opening does provide a pathway for infiltration of surface water and precipitation into

the tailings pile. If the joint separation problem is not corrected, surface water infiltration could

result in an increased amount of time for dewatering of the tailings pile. This problem should be

corrected as soon as possible, and no later than 12/31/2000.

- Tailings Pile #3 should also be observed very closely for similar signs of seepage, as it also abuts

the Club Mesa Area and could have the same types of cracks and fissures in the abutting wall that

causes ground water infiltration into Tailings Pile #1-2.

2. Tailings Pile #1-2- The presence of one seep into Tailings Pile #1-2 may indicate the presence of additional seeps.

Because this seep was identified only a few weeks prior to this Five-Year Audit, it is too soon to

know the potential seriousness of this problem and the overall effect on the stability of the Tailings

Pile. It does, however, indicate a potential source of additional water coming into the pile that may

increase the overall time required to dewater the Tailings Pile. Umetco should

immediately investigate this problem to determine the potential source(s) and mitigation

measures. The necessity for constructing additional water diversion channels in the Club

Mesa area above the Tailings Piles should be evaluated. It is essential that this

investigation be conducted and remedial action alternatives, if necessary, evaluated

and implemented as quickly as possible to ensure that the Tailings Pile is not compromised. It

-31-f:\Beck\RAC\Ura5-yr3.wpd [03/13/00]

is recommended that these actions be completed no later than mid-2001 so that the Tailings Pile can be monitored

prior to closure in December 2002.


Table 4.4.3-1

Club Mesa Tailings Piles


Completion


1. Design and construct a dewatering system for all

Tailings Piles that consist of shallow trenches,

sump pumps, and placement of fill in designated

areas on the Tailings Piles to surcharge these areas

to accelerate dewatering and consolidation.

Shall commence by

September 30, 1988

Commenced by September 30, 1988.

2. Design and construct slopes and contours of the

Tailings Piles so that the sides of the Tailings Piles

have been regraded to 3 (H): 1 (V) above the rock

buttress and are being covered with an interim soil

cover eighteen (18) inches thick at a minimum.

Completed when the

final Consent Decree

and RAP were issued

in 1987

Completed when the Final Consent Decree and RAP

were issued in 1987.

Placement of neutralized sludges and contaminated

soils in the Tailings Piles shall be in appropriate

lifts of an approved thickness and compacted in

accordance with Approved Final Plans and

Specifications.

River Ponds material:

December 31, 1990

Completed by mid-1989.

Club Mesa material:

December 31, 1994

Completed by December 31, 1994.

3. Neutralized sludges and contaminated soils shall be

placed in select locations on top of the Tailings

Piles at an outer slope of 5 (H):1 (V) or less.

At all times the

material is placed

Information regarding this requirement not discussed in

documents reviewed during this Five-Year Review.


Table 4.4.3-1



Completion


4. Tops of the Tailings Piles shall be contoured to slope

at three (3) percent grade away from the embankment

face. The surface shall be cambered in defined areas

to compensate for settlement of the underlying slimes.

Not specified in the RAP Information regarding this requirement not discussed in

documents reviewed during this Five-Year Review.

5. The rock Fill Buttress and Toe Drain System shall be

designed and constructed so that the existing rock fill

buttress is covered with 1.2 meters of Type A riprap

or as determined during final design and presented in

the Approved Plans and Specifications.

Not specified in the RAP Completed by December 31, 1993.

The toe drain system presently in place at the base of

the Tailings Piles shall be maintained until seepage

ceases. Seepage shall be collected and disposed of in

the lined Club Ranch Ponds.

Not specified in the RAP Ongoing

Cover for the rock fill buttress shall be obtained from

the Burbank Quarry or State-approved alternative

source. Placement and inspection of these materials

shall be conducted in accordance with the approved

Quality Control/Quality Assurance Program.

Not specified in the RAP Cover was obtained from the Burbank Quarry or the Surprise

Borrow Area on Club Mesa.


Table 4.4.3-1



Completion


6. The slide slope protective cover shall be designed and

constructed according to the specified slope, minimum

thickness requirements and material specifications.

The cover on the 3 (H): 1 (V) portion of the slope

shall consist of 0.9 meters of compacted clay, 0.9

meters of random fill, and 1.2 meters of riprap for a

total cover thickness of 3.0 meters.

December 31, 1989 Completed by December 31, 1989.

The cover on the 5 (H): 1 (V) portion of the slope will

consist of 0.9 meters of compacted clay, 1.5 meters of

random fill, and 0.6 meters of riprap, or as determined

during final design, for a total cover thickness of 3.0

meters

As soon as final

settlement will not

affect cap integrity

Completed by December 31, 1989.


Table 4.4.3-1



Completion


7. Top Cover:

The top cover shall consist of 0.9 meters of compacted

clay, 1.8 meters of random fill, and 0.3 meters of Type

B riprap for a total of 3.0 meters measured

perpendicular to the slope.

Clay and random fill

covers shall be in place

by December 31, 1996

Tailings Pile #3: Ongoing, 85% complete. Compacted clay

and random fill placed. Riprap will be placed when

settlement of tailings pile is complete.

Tailings Pile #1-2: Ongoing, Completion of the Top slope

cover is scheduled for completion by December 31, 2002.

Riprap, random fill, and clays shall be obtained from

the Burbank Quarry, the Borrow Area on Club Mesa,

or a State-approved alternative source.

At all times during

remedial activities

Ongoing, Riprap, random fill, and clays were obtained from

the Burbank Quarry or the Surprise Borrow Area on Club

Mesa.

8. Drainage Diversion:

The Club Mesa Spray Area runoff shall be directed

away from the Tailings Piles.

Permanent drainage

channels will be

operational by

December 31, 1996

Tailings Pile #3: Ongoing, 20% complete. A portion of the

drainage channel has been completed. Scheduled for

completion by December 31, 2002.

Tailings Pile #1-2: Ongoing, Scheduled for completion by

December 31, 2002.


Table 4.4.3-1



Completion


Drainage from areas adjacent to the Tailings Piles

shall be intercepted by a drainage ditch at the back of

the piles and conveyed through channels to a gully.

Riprap shall be sized to withstand the probable

maximum flood velocities across the piles and shall be

obtained from the Burbank Quarry or State-approved

alternate source.

Ongoing.

Surface runoff from the top of the Tailings Piles shall

be directed away from the embankment face and shall

be collected and conveyed by the drainage ditch and

channels to an existing gully.

Ongoing.

Surface runoff from faces of the embankments shall be

collected at the base of the embankments and

conveyed to the cliff face where long-term cliff retreat

shall not impact the disposal site. These collection

channels shall consist of a minimum of 4 feet of Type

A riprap overlying 1 foot of riprap bedding.


Table 4.4.3-1



Completion


9. A final construction report shall be submitted to the

State not later than ninety (90) days after the final

placement of riprap on the top of the Tailings

Ninety (90) days after

the final placement of

riprap on the top of the

Tailings Piles

Not required to-date. Final placement of riprap on top of

Tailings Piles has not occurred.

10. A Certification Report shall be submitted to the State

not later than 120 days after completion of all

remedial activities at the Uravan Facility.

120 days after

completion of all

remedial activities at the

Uravan Facility

Not required to-date. Remedial activities not completed.

11. Monitoring of the Tailings Pile shall be conducted

for:

- Dewatering rates, quantities, and quality

- Slope stability, including surface monuments and

any required slope indicators

- Piezometer levels

- Toe drain effluent rates, quantities and quality

- Siltation in runoff collection channels

- Monitoring of the rock fill buttress, side slope

cover, and drainage diversion channels.

Ongoing Ongoing.


Table 4.4.3-1



Completion


12. Performance of the remedial activities shall be

evaluated to assure long-term stability, cover

integrity, and the decline of seepage over time by

analysis of:

- Settlement rates

- Toe drain seepage rates

- Movement monuments, erosion monument, andslope indicator data, if required

- Aerial photography (after all remedial activitiesare complete).

Ongoing Ongoing.

Aerial photographs not required as remedial actions at the site

are not completed.

13. Long-term monitoring and maintenance after closure

of the Uravan Facility shall be conducted pursuant to

the Colorado Radioactive Materials License.

After closure of the

Uravan facility

Not required to-date.

Uravan Facility has not closed


4.5 Club Mesa Area

4.5.1 History

The Club Mesa Area is located upslope from Tailings Piles #1-2 and 3, as shown in Figures 2-2 and 2-3. This area

was used primarily for evaporation of raffinate. Mounds of raffinate crystals formed around the spray nozzles within

the spray areas. As part of the raffinate spray process, two clay-lined storage ponds were constructed upslope of

the raffinate spray area. The purpose of these ponds was to provide hydrostatic head for the spray system.

Neutralized sludge excavated from the River Ponds was also present in the Club Mesa Area.

Umetco estimated that approximately 484,000 cubic yards of contaminated materials were present in the Club

Mesa Disposal Area. These materials included 250,000 cubic yards of raffinate crystals; 150,000 cubic yards of

neutralized sludge; 40,000 cubic yards of contaminated pond material; and 44,000 cubic yards of contaminated

soils in the fringe area.

Surficial and subsurface contamination occurred as a result of the raffinate spray process. Surficial contamination

is due to the presence of the raffinate crystals, in addition to the windblown spray which contaminated soils in the

adjacent fringe area. Subsurface contamination is caused by seepage of excess spray liquids into the underlying soils

and bedrock through the unlined surface of the spray area.


In the RAP, the State selected excavation and on-site disposal of raffinate crystals in the Burbank Quarry, an

approved raffinate crystal storage area, and disposal of other contaminated solids in the Tailings Piles on Club Mesa

as the remedy for the Club Mesa Area. The objective of this remedy were to remove the source of future potential

contamination of surrounding soils and the underlying soils and bedrock.


4.5.3.1 Status December 1993 (Excerpted from EPA 1993 Five Year Review, Umetco 1997 Five Year Review,

CDPHE 1999 Uravan Remedial Action Plan Status Report)


Initial removal of crystals from the Club Mesa Area began in the summer of 1990 and was completed in mid-1992.

The final removal of the crystals that are resting on bedrock has yet to be performed. Removal of sludges and other

material commenced in the fall of 1989 and continues. The RAP calls for removal of contaminated materials by

December 31, 1994, with final reclamation by December 31,1995.

This component was approximately 80 percent complete as of December 1993.

The status of the underground mines and portals was not discussed by CDPHE in December of 1993.

4.5.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, CDPHE 1999 Uravan

Remedial Action Plan Status Report)

Approximately 350,000 cubic yards of contaminated materials were removed from Club Mesa prior to the

completion of final reclamation on December 31, 1997 (the original completion date of December 31, 1994 was

extended to December 31, 1997 by a modification to the RAP). Excavation of this area continued down to the

underlying bedrock. Mines and portals encountered during construction were sealed with earthen material per the

RAP. An erosion resistant rock/soil cover was added to a portion of the area to control runoff. The RAP was

modified in 1999 to require Umetco to evaluate the feasibility of dewatering the mines to minimize uncontrolled

releases of contaminated ground water.

Remedial action at this site is 100 percent complete as of October 14, 1999.

The Final Construction Report for the Club Mesa Disposal Area was submitted to the State for approval, in August

1997 and was approved in February 1998.

Table 4.5.3-1 summarizes the major requirements for remedial activities at the Club Mesa Disposal Area specified

in Section 4.5.2 of the RAP, required completion dates as specified in Section 4.5.4 of the RAP, and status as of

October 14, 1999.


Visual inspection during the site visits of October 13 and 14, 1999 indicated that the Club Mesa Area is fully

remediated. No signs of remaining contamination, e.g., crystals, discolored soil, ponds, etc., were observed during

the visit. Vegetation was beginning to re-establish itself on the mesa,

f:\Beck\RAC\Ura5-yr3.wpd [03/13/00]-41-

especially on the rock/soil cover. The vegetation appeared to be healthy. No open mines or portals were

observed in the Club Mesa Area, although several open mines and portals were observed in the off-site areas

not owned, operated, or under the control of Umetco.

4.5.5 Photographs

Photos 4.5-1 and 4.5-2 show the cleanup of the Club Mesa Disposal Area in May 1989. Photos 4.5-3 and

4.5-4 show the Club Mesa Disposal Area as of October 1999.

Recommendations:

1. None noted.


Table 4.5.3-1

Club Mesa Disposal Area


Site Status 10/14/99 Remedial Action at This Site 100% Completed as of

10/14/99

1. The following remedial activities shall be conductedin the Club Mesa Spray Area:- Remove 250,000 cubic yards of raffinate

crystals and 84,000 cubic yards of contaminatedsoils in the spray area and contaminated fringearea, respectively.

- Dispose the raffinate crystals in the securecrystal repository, the Burbank Quarry andcompact them in accordance with the ApprovedFinal Plans and Specifications.

- Excavate, place, compact, and dispose allcontaminated soils beneath the crystals andspray contaminated fringe areas on the tops ofthe Club Mesa Tailings Piles in accordance withthe Approved Final Plans and Specifications. Atleast one (1) foot of material and all surficialmaterials with greater than 20 percent byvolume raffinate crystals and scintillometerreadings greater than 30 FR/hr shall beexcavated. Excavation may stop whensandstone or silstone bedrock is encountered.

12/31/94

12/31/94

12/31/94

Completed by 12/31/94. Approximately 375,000 cubicyards of raffinate crystals, neutralized sludge, and othercontaminated materials were removed from Club Mesa.



Excavation removed materials down to underlyingbedrock.


Table 4.5.3-1




10/14/99

- Scintillometer surveys and soil assays forradionuclides and heavy metals shall beconducted after excavation is completed. Ifbedrock is encountered, soil sampling is notnecessary.

12/31/94 Completed by 12/31/94. Scintillometer surveys wereconducted. Soil samples were not required as excavationremoved materials down to the underlying bedrock.

- A drainage control system and radon covershall be designed for the Club Mesa SprayArea and Contaminated Fringe Area unlessexcavation stopped when sandstone or silstoneblock was encountered.

- Runoff controls shall be in place duringremedial activities.

- Runoff control structures on the Club MesaSpray Area and Contaminated Fringe Areashall be designed to direct runoff away fromthe Tailings Piles.

- The graded area shall be covered with at leastone (1) foot of random fill and shall bevegetated in accordance with a programapproved by the State unless bedrock isexposed and all applicable radon and otherpublic health standards and criteria are met, therandom fill is not required.

Not specified in RAP


9/30/93RAP modificationpermitted completion by12/31/9712/31/95

RAP modificationpermitted completion by12/31/97

Not required. Excavation removed materials down tounderlying bedrock

Not discussed in documents reviewed during this Five-Year Review.Completed by 12/31/97.

Completed by 12/31/97

Table 4.5.3-1




10/14/99


- If monitoring of the cover and vegetationperformance, after completion of remedialactivities but prior to closure of the UravanFacility demonstrates that performancerequirements as stated in the Quality Plan havenot been met, Umetco shall implementadditional State-approved remedial activities toachieve required performance criteria.

As required Not required to-date by State.

Table 4.5.3-1




10/14/99


2. The following remedial activities shall beconducted in the Neutralized Sludge DisposalArea:- Remove 150,000 cubic yards of neutralized

sludge stored on Club Mesa and place,compact, and dispose

12/31/94 Completed by 12/31/94.Approximately 375,000 cubic yards of raffinate crystals,neutralized sludge, and other contaminated materials wereremoved from Club Mesa.

- Excavate, place, compact, and dispose allneutralized sludge on the tops of the ClubMesa Tailings Piles in accordance with theApproved Final Plans and Specifications.

12/31/94 Completed 12/31/94.

- Excavate, place, compact, and dispose allcontaminated soils beneath the neutralizedsludge and place it on the tops of the ClubMesa Tailings Piles in accordance with theApproved Final Plans and Specifications. Atleast one (1) foot of material and all surficialmaterials with greater than 20 percent byvolume raffinate crystals and scintillometerreadings greater than 30 FR/hr shall beexcavated. Excavation may stop whenstandstone or silstone bedrock is encountered.

12/31/94 Completed by 12/31/94.


Table 4.5.3-1




10/14/99



12/31/94 Completed by 12/31/94.Scintillometer surveys conducted. Soil samples notrequired as excavation removed materials down tounderlying bedrock.

- A drainage control system and radon covershall be designed for the Neutralized SludgeDisposal Area or unless excavation stoppedwhen sandstone or silstone bedrock wasencountered.

- Runoff controls shall be in place duringremedial activities.


9/30/93RAP modificationpermitted completion by12/31/97

Not required. Excavation removed materials down to theunderlying bedrock.

Not discussed in documents reviewed during this Five-Year Review.

- Runoff control structures on the NeutralizedSludge Disposal Area shall be designed todirect runoff away from the Tailings Piles

12/31/95RAP modificationpermitted completion by12/31/97


Table 4.5.3-1




10/14/99


- The graded area shall be covered with at leastone (1) foot of random fill and shall bevegetated in accordance with a programapproved by the State. If bedrock is exposedand all applicable radon and other public healthstandards and criteria are met, the random fill isnot required.

RAP modificationpermitted completion by12/31/97


- If monitoring of the cover and vegetationperformance, after completion of remedialactivities but prior to closure of the UravanFacility demonstrates that performancerequirements as stated in the Quality Plan havenot been met, Umetco shall implementadditional State-approved remedial activities toachieve required performance criteria.

As required Not required to-date by the State.

Table 4.5.3-1




10/14/99


3. The following remedial activities shall beconducted in the Storage Ponds Area:- Excavate and remove 40,000 cubic yards of

raffinate crystals and contaminated pondmaterial from the Storage Ponds Area. Thematerials shall be placed, compacted, anddisposed of in accordance with the ApprovedFinal Plans and Specifications.

12/31/94 Completed by 12/31/94.

Approximately 375,000 cubic yards of raffinate crystals,neutralized sludge, and other contaminated materials wereremoved from Club Mesa.

- Excavate, place, compact, and dispose allcontaminated soils beneath the Storage Pondsand place it on the tops of the Club MesaTailings Piles in accordance with the ApprovedFinal Plans and Specifications. At least one (1)foot of material and all surficial materials withgreater than 20 percent by volume raffinatecrystals and scintillometer readings greater than30 FR/hr shall be excavated. Excavation maystop when sandstone or silstone bedrock isencountered.

12/31/94 Completed by 12/31/94.

Excavation removed materials down to the underlyingbedrock.

Table 4.5.3-1




10/14/99



12/31/94 Completed by 12/31/94.Scintillometer surveys were conducted. Soil samples werenot required as excavation removed materials down to theunderlying bedrock.

- A drainage control system and radon covershall be designed for the Storage Ponds Areathat meets applicable State requirements orunless excavation stopped when sandstone orsiltstone bedrock was encountered.

Not specified in RAP Completed by 12/31/97.

- Runoff controls shall be in place duringremedial activities to prevent releases ofhazardous substances.

Not specified in RAP Not discussed in documents reviewed during this Five-Year Review..

- Runoff control structures on the Storage PondsArea shall be designed to direct runoff awayfrom the Tailings Piles.

12/31/95

RAP modificationspermitted completion by12/31/97


Table 4.5.3-1




10/14/99


- The graded area shall be covered with at leastone (1) foot of random fill and shall bevegetated in accordance with a programapproved by the State. If bedrock is exposedand all applicable radon and other public healthstandards and criteria are met, the random fill isnot required.

12/31/95RAP modificationspermitted completion by12/31/97


- If monitoring of the cover and vegetationperformance, after completion of remedialactivities but prior to closure of the UravanFacility demonstrates that performancerequirements as stated in the Quality Plan havenot been met, Umetco shall implementadditional State-approved remedial activities.


Table 4.5.3-1




10/14/99


4. The following remedial activities shall beconducted in the Underground Mines and Portals:- All subsided areas shall be filled with

appropriate earth materials and compacted orgraded in accordance with Approved FinalPlans and Specifications

12/31/94 Completed by 12/31/94.Subsided areas were filled with earthen materials andcompacted or graded.

- All exposed mine portals shall be sealed inaccordance with the Approved Final Plans andSpecifications.

12/31/94 Completed by 12/31/94.Mines and portals were sealed with earthen materials.

5. The Final Construction Report shall be submittedto the State.

Not later than ninety(90) days after thecompletion ofvegetation at the Club Mesa Disposal Area

Completed.

The Final Construction Report was submitted in August1997 and approved by the State in February 1998.

6. A Certification Report shall be submitted to theState.

Not later than 120 daysafter completion of allremediation activities atthe Uravan site

Not required as of 10/14/99.

All remediation activities at the Uravan site have not beencompleted.

Table 4.5.3-1




10/14/99


7. Long-term monitoring and maintenance of thesurface configuration, vegetation, and groundwater shall be conducted pursuant to the ColoradoRadioactive Materials License.

After closure of Uravanfacility

Ongoing.


4.6 Mill Areas

4.6.1 History

The Mill Areas shown in Figures 2-2 and 2-3 include the A-Plant in the valley northwest of the Tailings Piles; the

B-Plant, Ore Stockpile Area, Barrel Storage Area, a Heap Leach site on a bench below and east of Tailings Pile

2, and a Bone Yard for miscellaneous scrap plant equipment located west of Tailings Pile 2. These areas had all

been impacted by the presence of radioactive materials.


In the RAP, the State selected excavation and on-site disposal of contaminated equipment, structure, waste

materials, contaminated soils and ancillary contaminated materials into the Tailings Piles, the Burbank Quarry, or

a disposal site in the Elk Claim Area as the remedy for the Mill Areas. The objectives of this remedy were to

remove the source of future potential contamination of surrounding soils and the underlying soils and bedrock.


4.6.3.1 Status December 1993 (Excerpted from EPA 1993 Five Year Review, Umetco 1997 Five Year

Review, CDPHE 1999 Uravan Remedial Action Plan Status Report)

Removal of contaminated materials from the Ore Stockpile Area, the Barrel Storage Area, Heap Leach Area, and

Boneyard area occurred during the period from early 1987 to late 1988. Remediation of the Ore Stockpile was

completed in 1989. In these areas, approximately 160,000 cubic yards of contaminated soils were removed down

to bedrock. In 1990 and 1991, seven thickener tanks were removed from the B-Plant Area for health and safety

reasons. Uranium and vanadium ores and mill reagents were sent to the White Mesa uranium facility in Utah.

Umetco submitted a plan to CDPHE for decommissioning in October 1992. A completeness review was performed

by the CDPHE and comments were sent to Umetco. The State informed Umetco that a decommissioning plan

addressing radiation exposure to workers must be submitted under the existing radioactive materials license.

This entire project was 10 percent complete as of December 1993.


4.6.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, CDPHE 1999 Uravan Remedial


Umetco initiated A-Plant and B-Plant decommissioning activities in 1995. This involved demolition of

uranium/vanadium milling systems and ancillary facilities located along the San Miguel River valley floor at the base

of Club Mesa and facilities located on the canyon face and lower bench immediately adjacent to the tailings piles.

Contaminated soils were also removed. The mill system included ore receiving bins and crushing/sampling plant,

aerofall grinding circuit, crushed and ground ore storage bins, hot sulfuric acid leach circuit, counter-current

decantation circuit, sulfuric acid generation plant, uranium ion exchange circuit, uranium precipitation and calcining

circuits, vanadium salt roast leach circuit, vanadium fusion circuit, metallurgical control laboratory, and solution

transfer system. The mill system also included ancillary facilities such as reagent storage and rnix systems, fuel supply

systems, steam generation systems, electrical supply systems, equipment maintenance systems, and office and

warehouse systems. Operative systems included maintenance, office, warehouse, electrical, and liquid transfer

systems. Verification gamma surveys and soil sampling of both the A-Plant and B-Plant were initiated during the

second quarter of 1999.

Mill demolition is 100 percent complete as of October 14, 1999. Removal of contaminated soils from the

A- and B-Plants is 100 percent complete as of October 14, 1999.

During the period of 1997 to 1998, approximately 100,000 cubic yards of contaminated soil was removed from

an area known as “Treasure Island” bounded by Heroglyphic Canyon and County Road EE-22. This material was

placed in Tailings Pile #1-2 for disposal. This activity is 100 percent complete as of October 14, 1999.

Beginning in the third quarter of 1998, Runoff Control Ponds RC-1 through RC-4 located in the APlant were

replaced with new Runoff Control Ponds RC-1, RC-2, and RC-4. The new Runoff Control Pond RC-2 was

placed into service in the fourth quarter of 1998. In the first quarter of 1999, the new lined Runoff Control Pond

RC-4 was placed into service and the old RC-4 (a.k.a.., the Swimming Pool) was demolished. RC-1 had not been

placed into service as of October 14, 1999.

The Final Construction Report has not been submitted to the State for approval as required by the RAP.


Table 4.6.3-1 summarizes the major requirements for remedial activities at the Mill Area specified in Section 4.6.2

of the RAP, required completion dates as specified in Section 4.6.4 of the RAP, and status as of October 14,

1999.


The site visits of October 13 and 14, 1999 visually found the Mill Area to be remediated. All buildings have been

demolished and areas had been excavated down to underlying bedrock. No visible signs of remaining

contamination, e.g., buildings, drums, equipment, discolored soil, ore, etc., were observed in the B-Plant on top

of the Club Mesa or at the base of the Mesa, e.g., A-Plant Area, during the visit. Vegetation was beginning to

re-establish itself on the mesa. The small amounts of vegetation present appeared to be healthy. Vegetation was

also starting to re-establish itself in the A-Plant Area. It also appeared to be sparse but healthy.

4.6.5 Photographs

Photos 4.6-1 and 4.6-2 show the A-Plant in May 1989. Photos 4.6-2 and 4.6-3 show the B-Plant in May 1989.

Photos 4.6-4 and 4.6-5 show the A-Plant Area in October 1999. Photos 4.6-6 and 4.6-7 show the B-Plant in

October 1999. Photo 4.6-8 shows the Former Boneyard as of October 1999.

Recommendations:

1. The Final Construction Report should be submitted to the State as soon as possible.


Table 4.6.3-1Mill Areas


Site Status 10/14/99Remedial Actions Completed by 10/14/99

1. The following remedial activities shall beconducted in the A- and B-Plants:

– Uncontaminated equipment, structures, andwaste materials from mill decommissioningmay be disposed of by sale, transferred toother UCC/Umetco facilities, transferred toan appropriate off-site solid waste site, ordisposed in the Tailings Pile, the BurbankQuarry or a disposal site in the Elk ClaimArea.

Within 3 years of notifyingState of intent todecommission. RAPmodification requiredcompletion by 12/31/99

Completed in 1999Mill decommissioning was initiated in 1995 and wascompleted in 1999.

– Contaminated equipment, structures andwaste materials from mill decommissioning,contaminated soils underlying the mill areas,and ancillary contaminated materials shall bedisposed of in the Tailings Pile, the BurbankQuarry, or a disposal site in the Elk ClaimArea.


Completed in 1999Mill decommissioning was initiated in 1995 and wascompleted in 1999.

– Excavation of contaminated soils in the A-and B- Plants shall continue untilscintillometer readings are less than 30 FR/hror until sandstone or siltstone bedrock isencountered. Materials shall be excavated,placed, and disposed on the Tailings Piles.


Completed in 1999 Excavation removed materials down to underlyingbedrock.





– Scintillometer surveys and soil assays forradionuclides and heavy metals shall beconducted after excavation is completed. Ifbedrock is encountered, soil sampling is notnecessary.


OngoingScintillometer surveys of A- and B-Plants initiated insecond and third quarters 1999, respectively. Soilsamples not required in B-Plant as excavationremoved materials down to underlying bedrock. Soilsampling in A-Plant initiated in second quarter 1999.

– Runoff controls shall be in place duringremedial activities to prevent releases ofhazardous substances.

During remedial activities Not discussed in documents reviewed during thisFive-Year Review.

– The A- and B-Plants Areas shall be gradedand vegetated to minimize soil erosion,except where bedrock is exposed at thesurface.

RAP modification requiredcompletion by 12/31/99

Not required. Excavation was taken to underlyingbedrock.

– If monitoring of the cover and vegetationperformance, after completion of remedialactivities but prior to closure of the UravanFacility demonstrates that performancerequirements as stated in the Quality Planhave not been met, Umetco shall implementadditional State-approved remedial activitiesto achieve required performance.






2. The following remedial activities shall beconducted in the Ore Stockpile Area:

– Contaminated surface materials in theStockpile Area will be shipped to the WhiteMesa Mill at Blanding, Utah or disposed ofby sale, transferred to other UCC/Umetcofacilities, transferred to an appropriate off-sitesolid waste site, or disposed in the TailingsPiles, the Burbank Quarry, or a disposal sitein the Elk Claim Area.


Completed in 1989.

Uranium/vanadium ores were relocated and processedat the White Mesa Mill in Utah.

– Excavation of contaminated soils in the OreStockpile Area shall continue untilscintillometer readings are less than 30 FR/hror until sandstone or siltstone bedrock isencountered. Materials shall be excavated,placed, and disposed on the Tailing Piles.


Completed in 1989.




Completed in 1989.

Scintillometer survey conducted. Soil sampling notrequired as excavation removed materials down tounderlying bedrock.






Not specified in RAP Not discussed in documents reviewed during thisFive-Year Audit

– The Ore Stockpile Area shall be graded andvegetated to minimize soil erosion, exceptwhere bedrock is exposed at the surface.


Not required. Excavation down to underlyingbedrock.







3. The following remedial activities shall beconducted in the Barrel Storage Area:

– Ship barrels containing feed material to theWhite Mesa Mill or to another UCC/Umetcofacility for processing

12/31/87 Completed in 1988. Materials sent to the White Mesa Mill.

– Transfer barrels containing intermediateprocess materials to the White Mesa Mill orother licensed facility for processing, or shallmove them to disposal on the Tailings Pile.After any limited processing of materialsauthorized by the Colorado RadioactiveMaterials License, the solid wastes shall bedisposed on the Tailings Pile and the liquidwastes shall be temporarily stored in theexisting tanks and finally disposed byevaporation in the lined Club Ranch Ponds.

12/31/87 Completed in 1988.Materials sent to the White Mesa Mill.

– Dispose hazardous wastes in accordance withrelevant regulations at an off-site disposal site.

12/31/87 Completed in 1988.

– Dispose analytical pulps on the Tailings Piles. 12/31/87 Completed in 1988.

– Ship exploration samples to the White MesaMill for processing or move them to disposalon the Tailings Piles.


– Move non-hazardous waste materials todisposal on the Tailings Piles.






– Contaminated soils in the Barrel Storage shallbe excavated. Excavation of contaminatedsoils in the Barrel Storage Area shall continueuntil scintillometer readings are less than 30FR/hr or until sandstone or siltstone bedrockis encountered. Materials shall be excavated,placed, and disposed on the Tailing Piles.

Not later than completion ofmill decommissioning

Completed in 1988.



Completed in 1988.Scintillometer surveys conducted. Soil samples notrequired as excavation removed materials down tounderlying bedrock.


At all times duringremediation

Not discussed in documents reviewed during thisFive-Year Review.







4. The following remedial activities shall beconducted in the Heap Leach Site:

– UCC/Umetco shall ship approximately15,000 tons of partially processed ore to theWhite Mesa Mill for processing or shall moveit to disposal on the Tailings Piles.


– Approximately 1,800 cubic yards of clay padand associated drainage piping shall bemoved to disposal on top of the Tailings Pilesor other approved location in accordance withthe Final Plans and Specifications.


– Contaminated soils in the Heap Leach Siteshall be excavated. Excavation ofcontaminated soils in the Barrel Storage Areashall continue until scintillometer readings areless than 30 FR/hr or until sandstone orsiltstone bedrock is encountered.

12/31/88 Completed in 1988.Excavation continued down to bedrock.


As required Completed in 1988.Scintillometer readings were taken. Soil samples werenot collected as excavation continued down tobedrock.





– Runoff controls shall be in place duringremedial activities.

During excavation Not discussed in documents reviewed for this FiveYear Review.



5. The following remedial activities shall beconducted in the Bone Yard:

– Contaminated materials shall be disposed onthe Tailings Piles. Materials found to beuncontaminated may be disposed on theTailings Piles or elsewhere in accordancewith applicable standards.

December 31, 1988 Completed in 1988.





– Ancillary contaminated materials shall beremoved and disposed of by sale, transferredto other UCC/Umetco facilities, transferred toan appropriate off-site solid waste site, ordisposed in the Tailings Piles, BurbankQuarry, or in a disposal site in the Elk ClaimArea.


– Contaminated soils in the Bone Yard shall beexcavated. Excavation of contaminated soilsin the Bone Yard shall continue untilscintillometer readings are less than 30 FR/hror until sandstone or siltstone bedrock isencountered. Materials shall be excavated,placed, and disposed on the Tailing Piles.


Excavation completed down to underlying bedrock.

– Scintillometer surveys and soil assays forraidionuclides and heavy metals shall beconducted after excavation is completed. Ifbedrock is encountered, soil sampling is notnecessary.


Soil samples were not collected as excavation wascompleted down to bedrock.





– Runoff controls shall be in place duringremedial activities to prevent releases ofhazardous substances required performance.

During excavation Not discussed in documents reviewed for this Five-Year Review.

– The Bone Yard shall be graded and vegetatedto minimize soil erosion, except wherebedrock is exposed at the surface.

Following completion ofremedial activities at theBone Yard

Not required. Bedrock is exposed at the surface.

– If monitoring of the cover and vegetationperformance, after completion of remedialactivities but prior to closure of the UravanFacility demonstrates that performancerequirements as stated in the Quality Planhave not been met, Umetco shall implementadditional State-approved remedial activities.

As required Not required to-date by the State





6. Other Mill AreasThe following remedial activities shall beconducted in the Other Mill Areas:

– Ancillary contaminated materials includingpipelines, deposits in ditches, surfacecontamination of roads, etc. shall be removedand disposed of by sale, transferred to otherUCC/Umetco facilities, transferred to anappropriate off-site solid waste site, ordisposed in the Tailings Piles, BurbankQuarry, or in a disposal site in the Elk ClaimArea.


Completed in 1988.

– Contaminated soils in the ditches and roadsshall be excavated. Excavation ofcontaminated soils in the Bone Yard shallcontinue until scintillometer readings are lessthan 30 FR/hr or until sandstone or siltstonebedrock is encountered. Materials shall beexcavated, placed, and disposed on theTailing Piles.


Completed in 1988.







Completed in 1988.


During excavation activitiesto prevent releases ofhazardous substances

Not discussed in documents reviewed during thisFive-Year Review.

– The area shall be graded and vegetated tominimize soil erosion, except where bedrockis exposed at the surface.


Completed in 1988, where required.


As required Not required to-date by State





7. A Final Construction Report shall be submitted tothe State.

Not later than ninety (90)days following completionof removal and/orexcavation activities

NOT SUBMITTED TO-DATE AS REQUIREDBY RAP.

8. A Certification Report shall be submitted Not later than 120 days aftercompletion of allremediation activities at theUravan site


All remediation activities at the Uravan site have notbeen completed.

9. Long-term monitoring and maintenance of thesurface configuration, vegetation, and groundwater shall be conducted in accordance pursuantto the Colorado Radioactive Materials License.


Ongoing.


4.7 Town and Adjacent Areas

4.7.1 History

The Town of Uravan, Figure 2-2, occupied the valley area just northwest of Tailings Pile #1-2. Adjacent areas are

the town dump, which is northwest of the town obliquely opposite to Atkinson Creek on the south side of the San

Miguel River, and areas adjacent to the town which were affected primarily by windblown material, including

Hieroglyphic Canyon, San Miguel River, and Atkinson Creek drainage ways. Tailings were used in localized

construction activities and were also spilled from delivery pipelines running through the town area. Wind- and

surface water-transported tailings were found in the town and adjacent drainages. Remnant tailings were also

located under Highway 141.


In the RAP, the State selected excavation and on-site disposal of contaminated materials, waste from the Town

Dump, remnant tailings, streamway and drainage way deposits, and windblown materials into the Tailings Piles, the

Burbank Quarry, or a disposal site in the Elk Claim Area as the remedy for the Town and Adjacent Areas. The

objectives of this remedy were to remove the source of future potential contamination of surrounding soils,

underlying soils, ground water, and surface water.



CDPBE 1999 Uravan Remedial Action Plan Status Report)

Removal of remnant tailings occurred from 1987 to 1989. Initial removal of remnant tailings under an entrance road,

within the Town of Uravan, and tailings up to the right-of-way for Highway 141 was completed in December 1989.

This activity is 100 percent complete.

Removal of remnant tailings under Highway 141 required approval by the Colorado Department of Transportation.

The RAP schedule called for initial removal to be accomplished by December 31, 1989. Removal of other

contaminated soils from the Town Area continued.

In 1991, Umetco performed surveys to determine the extent of contamination in the Atkinson Creek and

Hieroglyphic Canyon. The results of the Hieroglyphic Canyon survey were submitted to the


State. The survey indicated that no further remedial actions were needed. The investigation of the Town Dump was

completed in 1988. A plan for dump cleanup was submitted to the State in early 1991. The State commented on

the plan but had not received a new proposal from Umetco.

Removal of housing structures and contaminated soils in the Town of Uravan started in 1987. The RAP required

that contaminated materials be removed by December 31, 1994. The Town Area will be graded and revegetated

after the soil verification studies have been completed and approved by the State.

The Town and Adjacent Area Projects were approximately 40 percent complete.



No further work on the Remnant Tailings was needed or conducted. However, the Final Construction Report for

this work has not been submitted to the State for approval, even though required by the RAP.

Streamway and drainageway deposits include sediments in the San Miguel River, Atkinson Creek, and Hieroglyphic

Canyon. It was determined that sediments in the San Miguel River would not be removed. Umetco performed

surveys in 1991 to determine the extent of contamination in Atkinson Creek and Hieroglyphic Canyon.

Contaminated materials discovered at the mouth of Hieroglyphic Canyon were removed in 1994. Assessment of

the upper reach of Hieroglyphic Canyon indicated that no significant contamination existed in the streambed and

excavation of any low activity material would result in significant environmental impacts. Therefore,

low-concentration contaminated sediments in Hieroglyphic Canyon were not removed. Sediments identified within

1,000 feet of the San Miguel River will be removed if they exceeded 30 microRoentgens per hour. The results of

the Atkinson Creek survey have not been submitted to the State. The Final Construction Report for the work at

the mouth of Hieroglyphic Canyon has not been submitted to the State, even though required by the RAP.

This activity is approximately 40 percent complete as of October 14, 1999.

Removal of housing structures and contaminated soils in the Town of Uravan started in 1987 and was completed

in 1994. This activity resulted in the removal of more than 260 structures and excavation of approximately 186,000

cubic yards of contaminated soil. The RAP required that

contaminated materials be removed by December 31, 1994. The Town Area on the east side of the river was

graded and revegetated after all of the soil verification studies were completed and approved by the State. This


contaminated materials be removed by December 31, 1994. The Town Area on the east side of the river was

graded and revegetated after all of the soil verification studies were completed and approved by the State. This

activity is 100 percent complete as of October 14,1999. However, the Final Construction Report for the Town

Area has not been submitted to the State for approval, as required by the RAP. No documents were available for

review during this Five-Year Review indicating that soil verification studies were completed and/or approved by

the State, or that revegetation of the Town Area on the west side of the San Miguel River had been completed.

In 1997 and 1998, contaminated soils characterization was performed for Dispersed Deposits adjacent to Uravan,

including material located along the Mill Hillside, the water storage pond adjacent to Hieroglyphic Canyon,

Northeast Highway 141, and County Roads Y-11 and EE-22. All areas have been characterized and cleanup

activities have commenced. The foundations of the Joe Junior Mill have been removed and most of the tailings under

County Road EE-22 have been removed. These activities are 85 percent complete as of October 14, 1999.

Removal of hillside concrete foundations and appurtenant structures associated with the former Vanadium Plant

began in the first quarter of 1999. The concrete structures and the areas of gross contamination have been removed.

However, Umetco personnel indicated that contamination investigations have not been completed on this face of

Club Mesa. Umetco expects to find contaminant concentrations exceeding the cleanup levels. However, Umetco

is uncertain of the ecological effect that a total cleanup of contaminant residues on the Club Mesa face would have

on the San Miguel River. Umetco is concerned that rather than protecting the river, remedial activities would only

cause the contaminants to become more mobile due to soil erosion, thereby contaminating the river. Once the

contaminant investigations are completed and the data studied, Umetco expects to discuss cleanup options with

the State.

Characterization of materials in the Town Dumps was completed in 1988. Mill-related contamination was identified

in the Town Dumps during this investigation. Umetco estimated that approximately 120,000 cubic yards of material

would require excavation. Cleanup of the Town Dumps were performed in 1998. Approximately 250,000 cubic

yards of material were taken to new B-Plant Area Repository for disposal. Pending State approval of Umetco’s

Confirmation Investigation Report, final grading and reclamation of the area will be initiated. This activity is 99


Windblown materials were removed from areas to the southeast and northeast of the Boneyard, northeast of

Tailings Pile #1-2, and fringe areas of Club Mesa between 1993 and 1999. Additional


characterization of windblown materials was completed in 1997. Remedial activities for this material are being

developed in accordance with the RAP.

Table 4.7.3-1 summarizes the major requirements for remedial activities at the Town and Adjacent Area specified

in Section 4.7.2 of the RAP, required completion dates as specified in Section 4.7.4 of the RAP, and status as of

October 14, 1999.


The site visits of October 13 and 14, 1999 visually found the Town and Adjacent Areas to be mostly remediated.

All but two of the buildings in the Town of Uravan had been removed. The two buildings remaining, the Boarding

House and Town Civic Hall, have been designated as Historical Buildings and will remain at the site, Approximately

eight (8) feet of contaminated soil had been excavated and removed from a large part of the town area. No visible

signs of remaining contamination, e.g., buildings, drums, equipment, discolored soil, tailings, etc., were observed

in this area during the visit. Grading and re-vegetation of the town area appeared to have been completed, and small

amounts of healthy-looking vegetation have been re-established in this area.

The Town Dumps were excavated down to bedrock. Small areas of erosion were evident in the Town Dump

Areas. However, these erosional areas are expected to be addressed through final regrading and reclamation of

the area.

4.7.5 Photographs

Photos 4.7-1 through 4.7-3 is a panorama view of the San Miguel River Valley showing the Town of Uravan as

of July 1989. Photos 4.7-4 through 4.7-8 is a panorama view of the San Miguel River Valley showing the Town

of Uravan as of October 1999. Photo 4.7-9 shows the hillside below B-Plant with various concrete structures, as

of July 1989, while Photo 4.7- 10 shows the hillside without concrete structures in October 1999.

Recommendations:

1. Contamination investigations of the Mill Hillside should be completed as soon as possible.

2. Discussions with the State should be conducted as soon as possible after the investigations are complete to

determine the final cleanup plan for this area.


3. The initial cleanup criteria of the hillside area was based on visual determination of contaminant and structure

removal, followed by a scintillometer survey of the area. A risk assessment should be conducted for a scenario

of leaving the contaminants in place without further remediation to determine the potential long-term impacts

to humans and the environment. These risks can then be compared to the safety risks to workers removing site

contaminants from a very steep area and to the potential environmental risk of making remaining contamination

more susceptible to erosion caused by precipitation and wind.

4. The Final Construction Reports for the Town Areas, Hieroglyphic Canyon, and Remnant Tailings should be

submitted to the State for approval as soon as possible.

5. The investigation results of the Atkinson Creek stream bed should be provided to the State as soon as possible.


Table 4.7.3-1

Town and Adjacent Areas


Completion


Remedial Actions Completed as of 10/14/99

1. The following remedial activities shall be

conducted in the Town and Dispersed Deposits:

– Uncontaminated equipment, structures, and

waste materials from the Town of Uravan

may be disposed of by sale, transferred to

other UCC/Umetco facilities, transferred to

an appropriate off-site solid waste site, or

disposed in the Tailings Pile, the Burbank

Quarry or a disposal site in the Elk Claim

Area.


– Contaminated equipment, structures and

waste materials from the Town of Uravan,

contaminated soils underlying the mill areas,

and ancillary contaminated materials shall be

disposed of in the Tailings Pile, the Burbank

Quarry, or a disposal site in the Elk Claim

Area.



Table 4.7.3-1



Completion


– Excavation of contaminated soils in the Town

of Uravan, in adjacent areas along the San

Miguel Valley, and in such other adjacent

locations outside the waste repositories as

specified by the State, shall continue until

scintillometer readings are less than 30 FR/hr

or until sandstone or siltstone bedrock is

encountered.


Excavation removed materials down to underlying

bedrock.

– Scintillometer surveys and soil assays for

radionuclides and heavy metals shall be

conducted after excavation is completed. If

bedrock is encountered, soil sampling is not

necessary.


Scintillometer surveys conducted. Soil samples were

not required as excavation removed materials down to

underlying bedrock.

– Runoff controls shall be in place during

remedial activities to prevent releases of

hazardous substances.

During remedial activities Not discussed in documents reviewed during this

Five-Year Review.

– The Town and Dispersed Deposit Areas shall

be graded and vegetated to minimize soil

erosion, except where bedrock is exposed at

the surface.

12/31/94 The Town was graded and revegetated in 1994.

It was not required in other areas as excavation was

undertaken to underlying bedrock.


Table 4.7.3-1



Completion


– If monitoring of the cover and vegetation




requirements as stated in the Quality Plan

have not been met, Umetco shall implement

additional State-approved remedial activities

to achieve required performance.

As required Not required to-date by State of Colorado.


Table 4.7.3-1



Completion


Remedial Actions 99% Complete as of 10/14/99

2. The following activities shall be conducted in the

Town Dump:

– The Town Dump shall be investigated to

ascertain whether hazardous substances are

present.

Initiated by 6/30/87

Remedial action based on

State-approved schedule

Completed.

Investigations were conducted in 1988.

– Investigations shall include test pits and/or

borings, and laboratory tests.

Completed.


– The investigation program shall be submitted

to the State for approval.

Completed.


– If hazardous materials are present,

UCC/Umetco shall develop an action plan for

removal and disposal of the materials and

submit a plan to the State for review and

approval prior to implementation.

Completed.

Remedial action plan developed and submitted to

State in 1991.

– Remedial activities for removal and disposal

of Town Dump contaminated material shall

conform to federal and State rules and

regulations.

99% Completed by 10/14/99.

Town dump excavated in 1998 and 1999.


Table 4.7.3-1Town and Adjacent Areas


Completion


Remedial Actions Completed by 10/14/99


conducted in the Remnant Tailings Areas located

in and around the Town of Uravan including

material (1) located under Colorado Highway

141; (2) located beneath the entrance to B-Block;

(3) used for construction or backfill in the Town

of Uravan:

– Tailings deposits and associated contaminated

soils shall be removed from under ColoradoHighway 141 at such time the subsurface

may be exposed for any reason. The materials

shall be placed in Tailings Piles #1, 2, and/or

3. UCC/Umetco has no responsibility to

expose the subsurface or replace Colorado

Highway 141. UCC/Umetco shall have no

responsibility for removing these materials

after closure of the Tailings Piles.

12/31/89 Ongoing. Working with Colorado Department of

Transportation for any work on Highway 141.

Completed. Remnant tailings up to the Highway 141

right-of-way were removed as required by 12/31/89.

– Tailings and associated contaminated soils

shall be removed from beneath the entrance

road to B-Block and shall be placed on the

Tailings Piles.

12/31/89 Completed by 12/31/89.


Table 4.7.3-1



Completion


– Discrete deposits of radioactive materials

identified in the Town by previous surveys

and during cleanup activities shall be

removed, placed, and disposed on the

Tailings Piles.

12/31/89 Completed by 12/31/89.

– Excavation of contaminated soils in the

Remnant Tailings Areas shall continue until



encountered. Materials shall be excavated,

placed, and disposed on the Tailing Piles.

12/31/89 Completed by 12/31/89.





necessary.

12/31/89 Completed. By 12/31/89

Scintillometer surveys were conducted. Soil samples

were not required as excavation removed materials

down to underlying bedrock.



hazardous substances.

At all times during

remediation

Not discussed in documents reviewed during this

Five-Year Review.


Table 4.7.3-1



Completion










As required Not required to-date by State of Colorado.

Remedial Actions Not Completed as of 10/14/99


conducted for the Windblown Material:

– General windblown material in the Club

Mesa Area shall not be removed or plowed

due to the presence of a thin soils cover. To

the extent achievable, contaminated deposits

shall be removed if scintillometer readings are

more than 30 FR/hr.

Not specified in RAP Remedial activities are being developed.


Table 4.7.3-1



Completion


– Excavation of Windblown Materials and

contaminated soils shall continue until



encountered. Materials shall be excavated,

placed, and disposed on the Tailing Piles.






necessary.




hazardous substances required performance.



Table 4.7.3-1



Completion


– Sediment traps shall be constructed in the

immediate area of the Tailings Piles and

Spray Area and shall be designed to collect

sediment carried into the intermittently

flowing drainages.

12/31/87 Completed.

– Sediment traps shall be inspected at least once

per year and cleaned in accordance with

schedule given in the final plans and

specifications.

Annually Ongoing.











Table 4.7.3-1



Completion


Remedial Activities 40% Completed as of 10/14/99.


conducted in the Stream way and Drainage way

Deposits:

– Sediments in the San Miguel River, other

than those removed when the River Ponds

were excavated, shall not be removed.

Not applicable Sediments in the San Miguel River, other than in

River Ponds, have not been removed by Umetco.

– Concentrated contaminated sediments found

in the Atkinson Creek stream bed within

1,000 feet of the San Miguel River with

scintillometer readings greater than 30 FR/hr

shall be removed, placed, and disposed in the

Tailings Piles.

Not specified in RAP Investigation results have not been submitted to

Stateas of 10/14/99.

Sediments with scintillometer readings greater than 30

FR/hr have not been found in the Atkinson Creek

streambed within 1,000 feet of the San Miguel River.

– Excavation of contaminated soils in the

Stream way and Drainage way Deposits shall

continue until scintillometer readings are less

than 30 FR/hr or until sandstone or siltstone

bedrock is encountered. Materials shall be

excavated, placed, and disposed on the

Tailing Piles.

Not specified in RAP Completed by 12/31/94 for mouth of Hieroglyphic

Canyon. Not required for other areas.


Table 4.7.3-1



Completion






necessary.

Not specified in RAP Completed by 12/31/94 for mouth of Hieroglyphic




hazardous substances required performance.

During excavation Not discussed in documents reviewed during this

Five-Year Review.

– The excavated areas shall be graded and

vegetated to minimize soil erosion, except

where bedrock is exposed at the surface.

Following completion of

remedial activities

Completed by 12/31/94 for mouth of Hieroglyphic















6. The following remedial activities shall beconducted in Hieroglyphic Canyon:

– Concentrated contaminated material in theHieroglyphic Canyon streambed withscintillometer readings greater than 30 FR/hrmay be removed, after considering thetechnical feasibility, cost effectiveness,environmental impact, and threat to the publichealth.

Not later than 12/31/94 Completed.Upper reaches of Hieroglyphic Canyon not impacted.Contaminated materials at confluence with SanMiguel River removed as required by 12/31/94.

– Excavation of contaminated soils inHieroglyphic Canyon shall continue untilscintillometer readings are less than 30 FR/hror until sandstone or siltstone bedrock isencountered. Materials shall be excavated,placed, and disposed on the Tailing Piles.

Not later than 12/31/94 Completed by 12/31/94.

– Scintillometer surveys and soil assays forradionuclides and heavy metals shall beconducted after excavation is completed. Ifbedrock is encountered, soil sampling is notnecessary

Not later than 12/31/94 Completed by 12/31/94.


During excavation activities Not discussed in documents reviewed during thisFive-Year Review.


Table 4.7.3-1



Completion


– The area shall be graded and vegetated to

minimize soil erosion, except where bedrock

is exposed at the surface.

Not later than 12/31/94 Completed by 12/31/94, where required.










7. A Final Construction Report shall be submitted to

the State of Colorado.


days following completion

of removal and/or

excavation activities

FINAL CONSTRUCTION REPORTS FOR THE

TOWN AREAS, REMNANT TAILINGS, AND

HIEROGLYPHIC CANYON HAVE NOT BEEN

SUBMITTED TO THE STATE AS REQUIRED

BY THE RAP.

Final Construction Reports for the other areas are

not required as remediation activities in these areas

have not been completed as of 10/15/99.





8. A Certification Report shall be submitted to the State. Not later than 120 daysafter completion of allremediation activities atthe Uravan site


All remediation activities at the Uravan site havenot been completed.

9. Long-term monitoring and maintenance of thesurface configuration, vegetation, and ground watershall be conducted pursuant to the ColoradoRadioactive Materials License.


Ongoing.

-88-f:\Beck\RAC\Ura5-yr3.wpd [03/13/00]f:\Beck\RAC\Ura5-yr3.wpd [03/13/00]

4.8 Burbank Quarry

4.8.1 History

The Burbank Quarry, Figures 2-2 and 2-3, was intended to be the source of riprap for remedial activities. Random

fill and clays may be mined from the pit for use in remedial construction. The quarry shall also be the raffinate crystal

repository and may serve as the repository for other wastes as approved by the State.


The RAP required the placement of raffinate crystals removed from the Atkinson Creek Crystal Disposal Area,

the Club Ranch Evaporation Ponds, and the Club Mesa Spray Area in the below-grade Burbank Quarry. Crystals

were to be disposed in clay-lined cells that would be capped by earthen materials and riprapped for erosion

protection. Design of the cover was to include consideration of the probable maximum precipitation events and

maximum credible earthquakes.




The RAP schedule called for initiation of crystal placement by September 30, 1989, and placement of the final

reclamation cover not later than December 31, 2000. A small area could remain open to accept crystal residue

from the lined Club Ranch Evaporation Ponds until one year following disposal of the liners and residues from the

Ponds.

Placement of crystals was initiated in late September, 1989. Diversion ditches for the repository were constructed

in mid-1989 and were required to be in place by December 31, 1989. Revised plans and specifications were

accepted by the State to allow for construction of a seepage interception tunnel to be placed into the bedrock

adjacent to the repository. The revised plans also contained provisions for placing a clay liner up the interior

sideslopes of the repository.

Slightly more than 700,000 cubic yards of material has been placed in the repository from the Club Ranch Ponds

and Club Mesa Areas. Approximately 200 feet of the final cover, including rock cover, has been placed over the

repository.




Other than placement of raffinate crystals removed from Atkinson, Creek and the unlined Club Ranch Ponds, no

additional materials were added to the Burbank Quarry since 1993. Although the original RAP permitted part of

the Burbank Quarry to remain open until December 31, 2001 to receive raffinate crystals and liners from the lined

Club Ranch Evaporation Ponds, the RAP was amended to permit the placement of these materials into the new

B-Plant Repository rather than the Burbank Quarry Repository.

In 1996, access to the upper Burbank Quarry Repository was granted to the U.S. Department of Energy (DOE)

for use as a disposal area for Naturita-UMTRA Title I materials. Placement of these UMTRA materials into the

upper Burbank Quarry Repository was completed in late 1998. In mid-1998, a surface water diversion channel

was installed along the west side of the upper and lower Burbank Quarry Repository. The placement of the entire

cover, including rock armor, for the lower and upper Burbank Quarry Repository was completed in early January

1999, just after the December 31, 1998 RAP-imposed deadline. This delay was reportedly due to bad weather

at the site and to delays resulting from DOE contractor work on the upper Burbank Quarry Repository. Following

completion of work, the upper Burbank Quarry Repository was deeded to the DOE and was removed from the

boundaries of the Uravan Superfund Site.

In late 1995, a seep ponding below the lower Burbank Raffinate Repository was identified. These liquids were

collected in a containment pond and transferred to the lined Club Ranch Evaporation Ponds on an as-needed basis

through late-1998, when the containment pond was removed and a temporary seepage control system installed.

The temporary seepage control system traverses the slope of the repository and consists of a gravel filter blanket

and geotextile fabric covered by 1.5 feet of clay material. The system drains to a fluid collection sump at the eastern

corner of the repository. No further seepage liquids have collected in the temporary seepage control system since

its installation. This system is currently being monitored on a weekly basis.

Although required by the RAP, Umetco has not submitted a Final Construction Report to the State for approval.

Construction of this project is 100 percent complete.


Table 4.8.3-1 summarizes the major requirements for remedial activities at the Burbank Quarry Repository

specified in Section 4.8.2 of the RAP, required completion dates as specified in Section 4.8.4 the RAP, and status



The site visits of October 13 and 14, 1999 visually found the Burbank Quarry to be totally capped and covered.

Vegetation has not been re-established on the top cover of the Burbank Quarry, but has been re-established on

the outer boundaries of the quarry. The covers of the upper and lower sections of the Burbank Quarry are

contiguous, separated only by a fence and a surface water diversion channel. The surface water diversion channel

to divert surface water draining off the abutting mesa was observed on the west side of the cover.

4.8.5 Photographs

Photo 4.8-1 shows the Burbank Quarry Repository in May 1989. Photos 4.8-2 and 4.8-3 show the Burbank

Quarry Repository as of October 1999. Photo 4.8-2 shows both the Umetco and DOE’s parts of the Repository

and the western diversion ditch. The diversion ditch visible in the middle of the photo delineates the Umetco and

DOE parts of the facility. Photo 4.8-3 shows only the DOE part of the Repository and the western diversion ditch.

Recommendations:

1. The Final Construction Report should be submitted to the State for approval as soon as possible.


Table 4.8.3-1Burbank Quarry


Site Status 10/14/99Remedial Action 100% Completed as of 10/14/99

1. The following remedial activities shall be conducted inthe Burbank Quarry:– The existing quarry shall be mined to obtain

borrow material and riprap for use in the remedialaction program.

– The bottom of the quarry underlying the crystalrepository area shall be covered by at least one (1)foot of compacted in-situ or imported clay.

– The raffinate crystals removed from the AtkinsonCreek Disposal Area, Club Ranch Ponds, ClubMesa Area, and any other crystal disposal areasshall be placed, compacted, and disposed in thequarry “cells” in accordance with Approved FinalPlans and Specifications.

Consistent with need formaterial and shall notconflict with schedule forplacement of crystals

At all times duringplacement of raffinatecrystals

12/31/2000 except that anarea to contain crystalresidue from the ClubRanch Lined EvaporationPonds may remain openuntil one year followingdisposal of the liner andresidue from theevaporation ponds


Completed 12/31/93.


Note: RAP modified to permit disposal of the liner andresidue form the Club Mesa Lined Evaporation Ponds intothe B-Plant Repository.





– The deposited crystals shall be contained in thequarry without modification of the side slope. Thefinal exterior slope of the quarry shall be nosteeper than 3(H):1(V).

– The exposed surfaces shall be reclaimed with acover 1.83 meters thick, consisting of 0.33 metersof compacted clay, 0.84 meters of random fill, and0.66 meters of riprap, or as determined duringfinal design and presented in the Final Plans andSpecifications.

– Areas on the quarry walls which may emit watershall be evaluated and appropriate measures toprevent dissolving of crystals or disruption of therepository shall be implemented by UCC/Umetcoupon approval by the State.

– Runoff control structures shall be constructed todivert surface water away from the quarry.

– A drainage control system shall be constructedprior to the initiation of storage activities toprevent releases of hazardous constituents.

At all times duringplacement of crystals

12/31/2000


12/31/89

12/31/89


Completed by1/31/99.

Completed. A seepage interception tunnel wasplaced into the bedrock adjacent to the repository.A clay liner was also placed up the interior sides of the repository.







– If monitoring of the cover and vegetationperformance, after completion of remedialactivities but prior to closure of the Uravan Facilitydemonstrates that performance. requirements asstated in the Quality Plan have not been met,Umetco shall implement additional State-approvedremedial activities to achieve requiredperformance.

– If monitoring of the integrity of the cells prior toclosure demonstrates that the performancerequirements of the RAP are not met,UCC/Umetco shall 1 propose, for review andapproval by the State, and implement additionalremedial actions to achieve required performance.

As required

As required

Not required to-date by the State.

Not required to-date by the State.

2. A Final Construction Report shall be submitted to theState.

Not later than ninety (90)days following completion of removaland/or excavationactivities

NOT SUBMITTED TO-DATE AS REQUIRED BY RAP.





3. A Certification Report shall be submitted to the State. Not later than 120 days aftercompletion of allremediation activities at theUravan site


All remediation activities at the Uravan site havenot been completed.

4. Long-term monitoring and maintenance of the surfaceconfiguration, vegetation, and ground water shall beconducted pursuant to the Colorado RadioactiveMaterials License.


Ongoing.


4.9 Borrow Areas on Club Mesa

4.9.1 History

The Borrow Areas on Club Mesa are not contaminated. They were intended to be used as sources of clayey soils

and random backfill to be used during remedial activities. Figures 2-2 and 2-3 show the location of the Club Mesa

Borrow Area. Figure 2-3 also shows the location of the Valley Borrow Area.


Remediation activities at these areas will not be conducted. They are intended to be used as sources of clayey soils

and random backfill to be used during remedial activities.


4.9.3.1 Status December 1993

Not addressed by the previous Five-Year review.

4.9.3.2 Status October 1999 (Excerpted from CDPHE 1999 Uravan Remedial Action Plan Status Report)

Two borrow areas exist for the Uravan site. One site is located on Club Mesa above the Burbank Repository. The

other site is located in the valley on the east side of Highway 141 across from the Club Ranch Ponds. The borrow

area on Club Mesa was expanded in 1992 and 1997. Both borrow areas are operated in compliance with State

Mined Land Reclamation Permits. Bonding for borrow area reclamation is also held by the State Mined Land

Reclamation Division.

Table 4.9.3-1 summarizes the major requirements for remedial activities at the River Ponds Area specified in

Section 4.9.2 of the RAP, required completion dates as specified in Section 4.9.4 of the RAP, and status as of

October 14, 1999.


During the site visits of October 13 and 14, 1999 the Borrow Area on top of Club Mesa visually appeared to be

operated in accordance with its permit, although no actual work in this area was


ongoing during the site visit. The Borrow Area located on the east side of Highway 141 was not observed during

the site visit.

4.9.5 Photographs

Photo 4.9-1 through 4.9-3 show one of the Club Mesa Borrow Areas as of October 1999. It should be noted that

the mine adit visible in Photo 4.9-3, although located in the general area of the Borrow Area and the Burbank

Quarry Repository, is not owned, operated, or under the control of Umetco.

Recommendations:

1. None noted


Table 4.9.3-1Borrow Areas on Club Mesa


Completion


1. The following work activities shall be conducted in the

Borrow Areas:

– Borrow materials shall be excavated on an as-

needed basis during the implementation of the RAP.

– Construction and reclamation shall be conducted in

accordance with a plan prepared and submitted by

UCC/Umetco and approved by the State Mined Land

Reclamation Division.

At the completion of

remedial actions

At the completion of

remedial actions

Operations at Borrow Areas Ongoing as of

10/14/99.

Ongoing.

Ongoing.

2. Long-term monitoring and maintenance of the surface

configuration, vegetation, and ground water shall beconducted pursuant to the Colorado Radioactive

Materials License.

After closure of the

Uravan Facility

Ongoing.


5.0 DESCRIPTIONS OF REMEDIAL ACTIONS - LIQUIDS

5.1 Hillside Seepage and Tailings Liquids

5.1.1 Hillside Seepage

5.1.1.1 History

Seepage has been occurring intermittently along approximately 4600 linear feet of the Club Mesa rim. Seepage

occurs near the contact between the Summerville and Salt Wash Formations and exits the valley walls of

Hieroglyphic Canyon and the San Miguel River above the A-Plant Area. Some of the seepage is presently collected

in ditches and along roadways and conveyed to the Club Ranch Ponds. At the beginning of remedial action at this

site, UCC/Umetco estimated the seepage rate to be approximately 30 gallons per minute. The volume of hillside

seepage was expected to diminish with time. The hillside seepage is composed of geochemically-modified tailings

solutions from the Tailings Pile and the Club Mesa Spray Area. The level of total dissolved solids and ionic

concentrations are much lower than that of the parent solutions.

5.1.1.2 Remedial Objectives

Remediation activities will minimize the potential for discharge of contaminated surface waters from the site into the

San Miguel River, in violation of the site’s surface water discharge prohibition.

5.1.1.3 Site Status and RAP Requirements

5.1.1.3.1 Status December 1993 (Excerpted from EPA 1993 Five Year Review, Umetco 1997 Five Year


Improvements to the hillside seepage collection system were initiated and completed in 1988. Approximately 1500

linear feet of drainpipe and 3200 feet of drainage ditch were constructed to intercept seepage. Maintenance and

repair work were performed on some of the ditches in 1992.

Two evaporation ponds, Club Ranch Evaporation Ponds #7 and #8, were constructed to handle the contaminated

liquids intercepted by this project. These ponds were completed in May 1988. One pond developed liner problems

and was patched. A vent system was also placed under the liners to


prevent the formation of gas bubbles under the liners. The liner and vent work was completed in mid-December

1990.

Hillside seepage rates from the canyon walls below the tailings piles and upper mills were calculated to range from

1.4 to 3.8 gallons per minute. However, examination of field data sheets for 1991 indicated that the shotcrete lining

of the collection ditches was deteriorating and flows were being diverted under the shotcrete, thereby resulting in

an under-reporting of seepage rates. Flow rates in 1992, after the collection ditch repairs were completed, were

estimated at approximately 5.9 gallons per minute. The 1992 report indicated that the seepage continued to be high

in total dissolved solids and ions. It was noted that most of the seepage collects as icing on the canyon walls in the

winter and little data should be expected during this period.

5.1.1.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, CDPHE 1999


The Hillside Seepage Monitoring and Collection System, Figure 5.1.1-1 consists of four segments of shotcrete-lined

ditches which lead to three small diversion ponds located on the upslope side of the B-Plant Road. The RAP

required these ditches to be lined with high-density polyethylene (HDPE), but a field approval by the State

permitted shotcrete to be used as the ditch liner. The diversion ponds are referred to as the Upper Pond, Middle

Pond, and Lower Pond. The upper diversion pond collects seepage and runoff from the hillside above the top part

of the B-Plant Road. The middle diversion pond collects seepage and runoff above the center part of the B-Plant

Road. The lower diversion pond collects seepage and runoff from the hillside above the lower part of the B-Plant

Road and the hillside seepage and runoff above County Road EE-22 leading up to Hieroglyphic Canyon. These

three diversion ponds divert seepage and runoff to the new lined Runoff Collection Pond RC-4. In addition, a lower

collection system is located near the base of the Entrada formation that collects seepage exiting Club Mesa below

the hillside ditch system. The lower collection system consists of a series of shallow subsurface drains that gravity

feed collected liquids to sumps. The liquids are then pumped to the lined Club Ranch Evaporation Ponds.

Since its installation in 1988, the system has intercepted and collected more than 38 million gallons of hillside

seepage. Liquids continue to be transferred to the lined Club Ranch Evaporation Ponds for evaporation. Evaluation

of the 1998 flow measurements indicates a decreasing trend in flow rates. Average flow rates decreased from

approximately 5 gallons per minute in 1994 to approximately 3 gallons per minute in 1998, compared to an

estimated average rate of 30 gallons per minute in 1988. Umetco attributes the decreased flow rate to cessation

of the spray evaporation


system on Club Mesa, discontinued mill use, dewatering of the tailings piles, and reduction in perched zone at the

base of the Salt Wash Mesa.

Evaluation of the water quality data shows some variation in the chemistry of the hillside seepage between 1994

and 1998, although it remains high in total dissolved solids (TDS), magnesium, and sulfate. Umetco attributes the

variation to natural fluctuations in precipitation, infiltration, and runoff.

During mill decommissioning, approximately 600 linear feet of the collection pipes were removed in order to remove

building foundations and to excavate contaminated soil.

The only remaining part of the project is to remove the pipes and ditches when they are no longer needed and to

reclaim the disturbed areas.

A Final Construction Report for the Hillside Collection System was submitted to the State in April 1989.

The project is 95 percent complete as of October 14, 1999.

Table 5.1.1.3-1 summarizes the major requirements for remedial activities at the Hillside Seepage specified in

Section 5.1.1.2 of the RAP, required completion dates as specified in Section 5.1.1.4 of the RAP, and status as


5.1.1.4 Summary of Site Visit Observations and Findings

During the site visits of October 13 and 14, 1999, the Hillside Seepage Collection System visually appeared to be

operating as intended. Small seeps were observed at the base of the hill adjacent to County Road EE-22. The

seeps were collected in the shotcrete-lined ditch and directed to the Lower Pond at the base of Club Mesa. From

there, the liquids were transferred to the lined Runoff Collection Pond RC-4 and then to the lined Club Ranch

Evaporation Ponds. Seeps were also observed to be collected in the shotcrete lined ditches along the B-Plant Road

below Tailings Piles #1-2, #3, and the B-Plant Repository. Some of this seepage eventually was collected in the

Middle Pond which drained to RC-4, and then to the lined Club Ranch Ponds. Seepage collected in the ditch

below the Middle Pond was directed to the Lower Pond and eventually to the lined Club Ranch Evaporation

Ponds. Umetco had just completed maintenance on the shotcrete-lined ditches a few weeks before this Five Year

Review site visit. Areas with cracks or other deterioration were relined


with concrete. Minor maintenance on these shotcrete ditches had also been initiated during other years since the

1993 Five-Year Review.

5.1.1.5 Photographs

Photos 5.1.1.5-1 and 5.1.1.5-2 show the Hillside Seepage Collection System in place along County Road EE-22

as of October 1999. Seepage is visible in these photographs. Photo 5.1.1.5-3 shows the Hillside Seepage

Collection System in place along County Road EE-22 leading into the Lower Collection Pond as of October 1999.

Photo 5.1.1.5-4 shows the Lower Collection Pond as of October 1999. Photo 5.1.1.5-5 shows the Middle

Collection Pond located along the B-Plant Road, as of October 1999. Photo 5.1.1.5-6 shows lined Runoff

Collection Pond RC-4 as of October 1999.

Recommendations:

1. The field approval that permitted the use of shotcrete rather than HDPE to line the ditches should be

documented as an approved amendment to the RAP as soon as possible.


Table 5.1.1.3-1

Hillside Seepage


Completion


1. The following work activities shall be conducted for

the Hillside Seepage:

– Improvements shall be made to the existing

collection system and new collection ditches shall

be constructed so as to optimize the containment

of liquids. All existing and new collection ditches

and ponds shall be lined with HDPE lining to

enhance seepage collection

– A collection system shall be installed near the base

of the Entrada Formation and shall be designed

and operated to collect both surface flow and

interflow through the hillside colluvium. This

collection system shall consist of at least a four-

inch perforated polyvinyl chloride (PVC) pipe

embedded in a gravel-filled trench. The bottom of

the trench shall be lined with a relatively

impervious material to promote drainage into the

collection system.

12/31/88

12/31/88

95% Complete as of 10/14/99.

Not completed in the manner specified in the RAP.

Ditches were lined with shotcrete rather than

HDPE, based on field approval by CDPHE.



Table 5.1.1.3-1

Hillside Seepage


Completion


– Hillside and toe-berm seepage will continue to be

collected.

– Collected liquids shall be disposed in the Club

Ranch Ponds until lined evaporation Ponds in the

Club Ranch Pond Area are available.

– The lined Club Ranch Ponds shall be designed,

constructed, and installed with a synthetic liner to

prevent the migration of any hazardous

constituents into the subsurface soil, ground water,

or surface water during the operational life of the

pond.

Until concentrations are

less than ground water

agricultural-use criteria

and which would not

cause a violation of the

San Miguel River surface

water criteria

11/1/87

12/31/91

Note: RAP modified to

permit completion by

12/31/92

Ongoing.


Lined Club Ranch Evaporation Ponds #7 and 8

were installed in 1988.



Table 5.1.1.3-1Hillside Seepage



– Liquids may be stored in the lined surge pond onTailings Pile #2 as approved by the State. Theexisting lined upper return pond located in the B-Plant Area may be utilized for liquids storage aslong as it is required.

When it is no longerrequired

Storage no longer needed and lined surge pond onTailings Pile #2 and lined upper return pond in B-PlantArea taken out of service as of 10/15/99.

2. An approved ambient river (upstream) anddownstream San Miguel River monitoring programapproved by the State shall be initiated.

No later than 120 daysafter entry of the ConsentDecree

Ongoing.

3. An Annual Report of data collected in the San MiguelRiver and Hillside Seepage Collection Systemmonitoring programs shall be submitted to the State.

No later than March 31 ofeach year for each priorcalendar year

Completed each year as required.


Not later than 90 daysafter the completion ofconstruction

Completed

Submitted to the State in April 1989.

5. A Certification Report shall be submitted to the State. Not later than 120 daysafter completion of allremedial activities

Not required to-date as all remedial activities at the site have not been completed.

6. A Seepage Collection System performance evaluationreport shall be submitted to the State that discussed theeffectiveness of monitor wells V-766 and CRP-15 tointercept flows to the San Miguel River.

Not later than March 31 ofthe sixth year of seepagecollection and every fifthyear thereafter

Completed.

Included as Appendix F in the 1994 Annual Report.


Table 5.1.1.3-1Hillside Seepage



7. Long-term monitoring and maintenance of the surfaceconfiguration, vegetation, and ground water shall beconducted pursuant to the Colorado RadioactiveMaterials License

Upon closure of the UravanFacility

Ongoing.


5.1.2 Toe Berm Seepage and Tailing Dewatering Liquids

5.1.2.1 History

Liquids will be forced from the Tailings Piles during dewatering and consolidation and for some time prior to and

after final reclamation. Seepage is collected by a toe drain system at the base of the slopes of the Tailings Piles and

conveyed to the Club Ranch Ponds. UCC/Umetco estimates this seepage to be at a rate of approximately 30

gallons per minute. The hillside seepage is composed of geochernically-modified tailings solutions from the Tailings

Pile and the Club Mesa Spray Area. The level of total dissolved solids and ionic concentrations are much lower

than that of the parent solutions.


Remediation activities will minimize the potential for discharge of contaminated surface waters to be released from

the site into the San Miguel River, in violation of the site’s surface water discharge prohibition.




Liquids were being collected by the toe drain system and transferred to the lined Club Ranch Ponds. Flow rates

had decreased from approximately 30 gallons per minute to less than 5 gallons per minute. In 1991, the toe drains

flow averaged 4.8 gallons per minute from Tailings Pile #1-2 and 3.3 gallons per minute from Tailings Pile #3. The

toe drains for Tailing Piles #1-2 and #3 were flowing at 3.3 gallons per minute during the single measurement taken

in August 1992.

Two evaporation ponds, Club Ranch Ponds #7 and #8, were constructed to handle the contaminated liquids

intercepted by this project. These ponds were completed in May, 1988. One pond developed liner problems and

was patched. A vent system was also placed under the liners to prevent the formation of gas bubbles under the

liners. The liner and vent work was completed in mid-December 1990.




Liquids continue to be collected by the toe drain system, Figure 5.1.2-1, and transferred to the Tailings Water

Return Pond. These liquids are then transferred to the lined Club Ranch Evaporation Ponds for evaporation. Flow

rates from Tailings Piles #1-2 and #3 have decreased from approximately 30 gallons per minute in 1988 to less than

4.0 gallons per minute in 1998. The seepage flow in 1998 is more than that reported for 1997, i.e., 3 gallons per

minute. The difference was explained by Umetco to be due to maintenance conducted on the toe drain system in

1998. The drain system was mechanically cleaned with clear water in the spring of 1998, thereby removing built-up

solids.

In 1999, a new lined Tailings Return Water Pond on Club Mesa is to be installed that would replace the current

Tailings Return Pond that is located inside the new B-Plant Repository footprint. In addition to the replacement of

the Pond, existing toe drain lines located below Tailings Piles #1-2 and #3 and within the B-Plant Repository

footprint are to be abandoned and new lines installed along the perimeter of the new B-Plant Repository. The new

drain lines would also be constructed of 4 inch diameter HDPE. Existing toe drain sumps and other toe drain lines

are to remain in place. This project is to be completed by December 31, 1999.

Table 5.1.2.3-1 summarizes the major requirements for remedial activities at the River Ponds Area specified in

Section 5.1.2.2 of the RAP, required completion dates as specified in Section 5.1.2.4 of the RAP, and status as



The site visits of October 13 and 14, 1999 visually found the Toe Drain Collection System to be operating as

intended. Parts of the toe drain systems were visible along the toes of Tailings Pile #1-2 and #3. Vertical clean out

vents were also visible along the toes of the Tailings Piles. The drains led to various collection sumps. From there,

the liquids were transferred to the lined Club Ranch Ponds. A new toe drain system was currently being installed

along the toe of the B-Plant Repository. This construction appeared to be conducted in accordance with the RAP.

The new lined Return Water Pond was also observed during the visit. Umetco personnel indicated during the visit

that construction of the new Return Water Pond was completed and should be placed into service within a few days

after the new toe drain lines were installed and connected to the Pond. Tailings Pile #1-2 toe drain sump #2 was

observed during the visit. It was a large concrete structure that appeared to


be maintained and in good condition. A small quantity of fluid was present inside the sump. According to Umetco

personnel, several pumps had to be rebuilt recently to ensure continued, uninterrupted operation of this system.

A Final Construction Report for the existing Toe Berm Seepage System has not been submitted to the State for

review.

5.1.2.5 Photographs

Photo 5.1.2.5-1 shows Tailings Pile #1-2 toe drain sump #2 located at the northeast comer of Tailings Pile #1-2

as of October 1999. It is similar to others installed along the base of Tailings Piles 1-2 and Tailings Pile #3. Piping

is similar to the new toe drain line being installed along the toe of the new B-Plant Repository. Photo 4.6-6 shows

the old and new lined Return Water Pond on the new B-Plant Repository. The new Pond is located at the top of

the photograph while the old Pond is located in the center of the right side of the photo.

Recommendations:

1. The Final Construction Report for the entire Toe Berm Seepage System should be submitted to the State as

soon as the new system around the B-Plant Repository is completed.


Table 5.1.2.3-1Toe Drain Collection System


Site Status 10/14/9995% Complete as of 10/14/99

1. The following work activities shall be conducted for theToe Drain Collection Seepage:– Trenches and sumps shall be constructed in selected

areas of the Tailings Piles to enhance dewateringand consolidation of the tailings. The liquidscollected shall be pumped to the lined evaporationponds in the same manner as the contaminatedhillside seepage.

– The toe berm seepage shall continue to be collectedin the existing collection system until such seepageceases and shall be evaporated in the lined ClubRanch Ponds. Liquids are being collected by the toedrain system and are being transferred to the linedClub Ranch Ponds.

– Collected liquids shall be disposed in the ClubRanch Ponds until lined evaporation Ponds in theClub Ranch Pond Area are available.

As required anddetermined in the field

Until seepage ceases

11/1/87

Ongoing

Ongoing


Lined Club Ranch Evaporation Ponds #7 and 8were installed in 1988.





– The lined Club Ranch Ponds shall be designed,constructed, and installed with a synthetic liner toprevent the migration of any hazardous constituentsinto the subsurface soil, ground water, or surfacewater during the operational life of the pond.

12/3/191

Note: RAP modified topermit completion by12/31/92


3. An approved ambient river (upstream) and downstreamSan Miguel River monitoring program approved by theState shall be initiated.

No later than 120 daysafter entry of the ConsentDecree

Ongoing.

4. An Annual Report of data collected in the San MiguelRiver monitoring program shall be submitted to the State.

Not later than March 31of each year for eachprior calendar year

Completed each year as required from 1993through 1998.


Not later than 90 daysafter the completion ofconstruction

To be completed.

6. A Certification Report shall be submitted to the State. Not later than 120 daysafter completion of allremedial activities

Not required to-date. All remedial activities at thesite have not been completed.





7. A Seepage Collection System performance evaluationreport shall be submitted to the State that discusses theeffectiveness of monitor wells V-766 and CRP-15 tointercept flows to the San Miguel River.

Not later than March 31 ofthe sixth year of seepagecollection and every fifthyear therefore

Completed. Included as Appendix F of the 1994Annual Report.

9. Long-term monitoring and maintenance of the surface configuration, vegetation, and ground water pursuant tothe Colorado Radioactive Materials License

Upon closure Ongoing


5.2 Ponded Liquids

5.2.1 Club Ranch Ponds

5.2.1.1 History

Contaminated liquid contained in the Club Ranch Ponds consisted primarily of toe drain and hillside seepage

collected since mid-1985 and raffinate solution contained in the ponds since the last discharge of raffinate to the

ponds in 1984. These liquids seeped into the subsurface at an undetermined rate. Ponded water evaporates at a

rate of approximately two gallons per minute per acre.


Remediation activities will minimize the potential for contaminated surface waters to be released into the underlying

bedrock and aquifer.




Construction of two lined evaporation ponds, Club Ranch Ponds #7 and #8, was completed in May 1988. Liquids

from the unlined Club Ranch Ponds #1 through #6, were then transferred into the lined Club Ranch Ponds. This

liquid transfer was completed by December 31, 1988. Project 100 percent complete as of December 31, 1988.



Liquids are still collected in the lined Club Ranch Ponds. No further action was required by the RAP. The liner of

Club Ranch Pond #8 was replaced in 1998. Minor maintenance activities to repair small holes or tears in the liners

were completed on the lined Club Ranch Evaporation Ponds between 1993 and 1998. Additional discussions on

the status of the Club Ranch Evaporation Ponds can be found in Section 4.2 of this document. The project is 100



Table 5.2.1.3-1 summarizes the major requirements for remedial activities at the Club Ranch Ponds Area specified

in Section 5.2.1.2 of the RAP, required completion dates as specified in Section 5.2.1.4 of the RAP, and status



The site visits of October 13 and 14, 1999 visually found the lined Club Ranch Ponds to be operating as intended.

The unlined Club Ranch Ponds were removed from service, although their berms were still in place. The areas

within the berms had been excavated down to the underlying bedrock. No liquids were observed inside the berms.

Recommendations:

1. None noted


Table 5.2.1.3-1

Club Ranch Ponds


Completion


Required Action 100% Completed as of 10/14/99


the Club Ranch Ponds:

– All liquid waste in the existing unlined Club

Ranch Ponds shall be evaporated in place.

Movement of liquids from a Club Ranch Pond

to another Club Ranch Pond is allowed

12/31/88 Completed by 12/31/88.

Liquids from unlined Club Ranch Ponds transferred into

new lined Club Ranch Ponds #7 and 8 for evaporation.


5.2.2 Other Liquids

5.2.2.1 History

Liquids of an undetermined chemistry may accumulate in the River Ponds and the Storage Ponds on Club Mesa.

Liquids, if not removed, will likely seep into the underlying subsurface zones from unlined ponds. Additional liquids

were stored within the mill circuit, with a maximum storage capacity of 4,100,000 gallons.


Remediation activities will minimize the potential for contaminated surface waters to be released into the underlying

subsurface zones.


5.2.2.3.1 Status December 1993 (Excerpted from EPA 1993 Five Year Review, Umetco 1997 FiveYear


Construction of two lined evaporation ponds, Club Ranch Ponds 7 and 8, was completed in May 1988. Liquids

from the River Ponds, were then transferred into the lined Club Ranch Ponds. The removal of the River Ponds was

completed by December 31,1989. The project was 100 percent complete as of December 31, 1993.

Remediation of the Club Mesa Spray Disposal Area began in the summer of 1990 and was completed in 1992.

The project was 100 percent complete as of December 31, 1993.

Removal of liquids from the mill circuits had not started by end of December 1993. The project was 0 percent

complete as of December 31, 1993.

5.2.2.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, CDPBE 1999


Decommissioning of the mills, including removal of the liquids in the mill circuits, started in 1995 and was completed

in 1999. The project is 100 percent complete as of October 14, 1999.


Table 5.2.2.3-1 summarizes the major requirements for remedial activities at the Other Liquids specified in Section

5.2.1.2 of the RAP, required completion dates as specified in Section 5.2.1.4 of the RAP, and status as of October

14, 1999.


During the site visits of October 13 and 14, 1999, the River Ponds were observed to be totally remediated, as

discussed in Section 4.3 of this report. The unlined Club Mesa Storage Ponds were found to be removed and no

longer in service, as discussed in Sections 4.2 and 5.2.1 of this report. Both the A- and B-Plants had been totally

demolished and all mill circuit liquids removed from the respective areas, as discussed in Section 4.6 of this report.

Recommendations:

1. None noted.


Table 5.2.2.3-1

Other Liquids


Completion


Required Actions 100% Completed as of 10/14/99


liquids in River Ponds, Storage Ponds on Club Mesa,

and liquids in the mill circuit:

– All liquids in River Ponds shall be pumped to the

Club Ranch Ponds.

– All liquids in Storage Ponds on Club Mesa shall be

pumped to the Club Ranch Pond.

– Liquids within the mill circuit shall be disposed of

in lined ponds.

On an annual basis until

the River Ponds are

removed

On an annual basis until

the Storage Ponds are

removed

As necessary and in a

manner so as not to

delay other scheduled

RAP activities

Remedial Actions Completed by 12/21/89.

Liquids from the River Ponds transferred into new

lined Club Ranch Ponds #7 and #8 for evaporation in

1989.


Liquids from Storage Ponds on Club Mesa transferred

into new lined Club Ranch Ponds #7 and #8 for

evaporation by the end of 1992.



5.3 Surface Runoff

5.3.1 History

Surface water runoff from the Umetco Uravan Superfund Site will continue to occur after reclamation of the

facilities. Hydrology studies for the existing and reclaimed facilities were conducted for UCC/Umetco by Dravo

Engineers. Water quality of the storm runoff was undefined but would be governed by Section 5.3.3 of the RAP.


Remediation activities will minimize the potential for contaminated surface waters to be released into the San Miguel

River.




The surface water runoff control facilities have been maintained and monitored since implementation of the RAP

in 1987. These activities will continue until the related remedial activities are completed.



Figure 5.3.3-1 shows the Runoff Collection System. Existing Runoff Control Ponds RC-1, RC-2, and RC-4 were

replaced in 1998. Replacement Pond RC-2 was placed into service during the fourth quarter of 1998. Lined

Replacement Pond RC-4 was placed into service and the previous RC-4, e.g., the “Swimming Pool”, was

demolished during the first quarter of 1999. Replacement Pond RC-1 will be placed into service after its diversion

piping system is completed in the fourth quarter of 1999. The existing Runoff Control Pond, RC-3, remains in

service as of October 1999.

The surface water runoff control facilities have been maintained and monitored since implementation of the RAP

in 1987. These activities will continue until the related remedial activities are completed.


Table 5.3.3-1 summarizes the major requirements for remedial activities for the Surface Runoff specified in Section

5.3.2 of the RAP, required completion dates as specified in Section 5.3.4 of the RAP, and status as of October

14, 1999.


Surface waters coming off the Club Mesa Areas are collected initially in the Hillside Seepage Collection Systems,

consisting of shotcrete-lined drainage ditches and associated sumps. Surface water collected in the sumps is then

pumped and/or gravity drained to one of two unlined runoff collection ponds, RC-1 or RC-2, depending on the

location of the sumps. Surface water collecting in RC-3 comes from drainage off the northeast end of Club Mesa.

Water from these ponds is pumped within 30 days of collection to the lined runoff collection pond RC-4. Water

from RC-4 is then transferred to the lined Club Ranch Ponds.

The site visits of October 13 and 14, 1999 visually found the surface water control system in good condition and

functioning as intended. None of the four runoff collection ponds contained water during the visits. As discussed

in Section 5.1.11, the lined drainage Hillside Seepage Collection System ditches had recently been repaired and

were in good condition.

Recommendations:

1. None noted.


Table 5.3.3-1

Surface Water Runoff


Completion


Remedial Actions Ongoing as of 10/14/99


Surface Water Runoff:

– UCC/Umetco shall design, maintain, and operate

the runoff collection and sedimentation ponds to

contain a 10-year, 24-hour storm event.

– In the event of a storm in excess of a 10-year, 24-

hour storm event, the overflow shall be discharged

to the San Miguel River.

– Operations shall include procedures for restoring

the pond capacity following a major precipitation

event. Liquids detained from surface precipitation

runoff shall only be used as follows:

• Evaporated in the Club Ranch Ponds

• Used as construction water for dust control on

top of the Tailings Piles or for compaction of

contaminated material.

As specified in the

Approved Final Plans

and Specifications

As required

Within thirty (30) days

Designed, maintained, and operated as required as of

12/31/86.

An overflow of the surface water control ponds has not

occurred as of 10/14/99.

Ongoing. Procedures have been written. Liquids used

as specified.

2. Clarified liquid and runoff shall be analyzed at least

once every two years for specified parameters.

Every two years Ongoing.


Table 5.3.3-1

Surface Water Runoff


Completion


Remedial Actions Ongoing as of 10/14/99

3. If overflow occurs, runoff shall be analyzed for

additional specified parameters.

When overflow occurs Not required to-date. An overflow of the surface water

control ponds has not occurred as of

10/14/99.

4. A Performance Evaluation Program for the

Sedimentation Ponds shall be initiated to verify that

the ponds are functioning as designed. If the State

determines prior to closure that performance levels

have not been achieved, UCC/Umetco shall propose

and implement additional remedial action.

As required Not required to-date by State.

5. Long-term monitoring and maintenance, if any, after

closure of the Uravan Facility shall be conducted

pursuant to the Colorado Radioactive Materials

License

As required by the

Colorado Radioactive

Materials License

Not required to-date by State. Uravan Facility has not

closed


5.4 Ground Water

5.4.1 Club Mesa Salt Wash Member of the Morrison Formation

5.4.1.1 History

Seepage from Uravan Mill operations and waste disposal has infiltrated into the Salt Wash and has created a body

of perched fluids on Club Mesa. This infiltration primarily consists of raffinate from the Club Mesa Spray Area and

seepage from the Tailings Piles. Hydrologic data monitoring wells constructed into the Salt Wash indicate that the

areal extent of the fluids is in the area beneath and down gradient from the three Tailings Piles and the spray

evaporation area. The direction of flow is to the northeast towards the valley walls of the San Miguel River and

Hieroglyphic Canyon. Discharge of this contamination from the Salt Wash occurs as a series of hillside seeps on

the face of the valley walls.


Remediation activities will minimize the potential for contaminated subsurface waters to be released into the San

Miguel River.




Four wells were completed in this formation, V-763S, V-770, V-771, and V-772, and were monitored annually.

All four wells had elevated concentrations of TDS, sulfate, and dissolved natural uranium. Monitoring results of

three of the four wells from 1988 through 1993 showed little change in water quality. The fourth well, V-772, had

steady increases in TDS, chloride, sulfate, and ammonia. Water levels were consistent from 1988 through 1993,

indicating that the ground water system has reached a point of relative equilibrium.

-123-

5.4.1.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, CDPHE 1999 Uravan


Four wells are completed in this formation, V-763S, V-770, V-771, and V-772, to monitor the raffinate solutions

perched on the Summerville Formation, Figure 5.4.1-1. Appendix 3 summarizes the monitoring results for these

four wells, as reported in the Umecto Uravan Revised 1996 and 1998 Annual Environmental Monitoring Reports.

Monitoring results for 1997 were not evaluate during this Five-Year Review, as the 1997 Annual Environment

Monitoring Report was unavailable for review. In addition, results for Well V-771 were not included in the 1998

Annual Environmental Monitoring Report. With a few notable exception, monitoring wells V-770, V-771, and V-

763S generally showed a relatively consistent water quality between 1994 and 1998. Concentrations of most

contaminants fluctuated throughout this time period. However, in 1998, monitoring well V-770 showed as increase

in radium-226 concentrations over those seen in previous years. Monitoring results for well V-772 in 1998 showed

increased concentrations of ammonia, calcium, chlorides, manganese, potassium, sodium, sulfates, TDS, vanadium,

and zinc. These results demonstrate that contaminant concentration in this aquifer are not decreasing very quickly.

Water levels in these monitoring wells between 1993 and 1998 were generally constant. However, in 1998, the

level of monitoring well V-763S was at its lowest level since 1985 and monitoring wells V-770 and V-772 were

at their highest levels measured to-date.

The RAP requires monitoring of wells V-762, V-763S, V-764S, V-770, V-771, and V-772. No information was

available for review from 1993 to 1998 as to whether wells V-762 and V-764S have been abandoned or whether

monitoring of only the four wells was approved by the State.

Table 5.4.1.3-1 summarizes the major requirements for remedial activities at the Club Mesa Salt Wash Monitoring

Wells specified in Section 5.4.1.2 of the RAP, required completion dates as specified in Section 5.4.1.4 of the

RAP, and status as of October 14,1999.


The site visit of October 12 and 13, 1999 did not find any observations of note regarding these wells.

f:\Beck\RAC\Ura5-yr3.wpd [03/13/00]


Recommendations:

1. If monitoring well V-771 actually was monitored in 1998, these values should be placed into the 1998 Annual

Report. Otherwise, the Annual Report should be amended with an explanation or note indicating why it was

not sampled.

2. Information should be provided in the Annual Reports indicating the status of monitoring wells V-762 and

V-764S.


Table 5.4.1.3-1Club Mesa Salt Wash Member of the Morrison Formation

RAP Requirements Required Date of Completion

Site Status 10/14/99Ongoing as of 10\14\99

1. The following work activities shall be conducted forthe Club Mesa Salt Wash Member of the MorrisonFormation:S UCC/Umetco shall collect and dispose of

contaminated hillside and toe berm seepage.

S UCC/Umetco shall collect monitor the Salt WashWells on Club Mesa as prescribed in Addendum A:

• V-762• V-763S• V-764S• V-770• V-771• V-772.

Within 60 days ofapproval by State

Completed

Partially completed

Note: Monitoring wells V-762 and V-764S are not included in annual monitoring.

1998 monitoring results for well V-771 was notavailable for review.

2. Sample results shall be compiled in an Annual Reportssubmitted to the State by March 31 of the followingcalendar year.

3/31/87 Completed and ongoing

3. Performance evaluation for the Salt Wash Formationshall be a description of monitor well data forcomparison to past information.

In each Annual Report Completed and ongoing


Table 5.4.1.3-1

Club Mesa Salt Wash Member of the Morrison Formation


Completed


Ongoing as of 10/14/99

4. Long-term monitoring and maintenance, if any,

after closure of the Uravan facility shall be

conducted pursuant to the Colorado

Radioactive Materials License.

Pursuant to the Colorado

Radioactive Materials License

Not required to-date. The Uravan facility has not

closed.


5.4.2 Club Mesa-Kayenta-Wingate Sequence

5.4.2.1 History

UCC/Umetco’s past operations on Club Mesa and past waste disposal activities pose potential impact to the

ground water quality in the Kayenta-Wingate aquifer beneath Club Mesa. Past activities which could potentially

impact the aquifer were the use of the Club Mesa Spray Area and Tailings Piles. These activities have ceased and

the areas reclaimed. Seepage of infiltrated raffinate and seepage of liquid from the Tailings Piles is collected and

is expected to abate over time.

The low permeability of the Summerville shale formation above the Kayenta-Wingate aquifer prevents or retards

significant contaminant movement down to the Kayenta-Wingate. In 1986, UCC/Umetco drilled wells V-768 and

V-769 into the Kayenta-Wingate Formation beneath Club Mesa. These wells showed no significant contamination

at the time that they were drilled.


Sampling of Club Mesa wells that monitor the Kayenta-Wingate Formation shall provide data for continuing

confirmation that ground water quality in the Kayenta-Wingate Formation is acceptable.




Six monitoring wells were completed on Club Mesa in the Kayenta/Wingate Formations. Three of the wells had

been monitored seven times between 1988 and 1992. The other three wells were newly installed and were

monitored only in 1991 and 1992. Water levels in all of these wells had not reflected much change. Of the six wells,

samples from three showed high concentrations of sulfates and TDS. Samples from two of the wells showed high

dissolved natural uranium ranging from 261 to 1,400 pCi/L. Concentrations of the other radionuclides are relatively

low. Monitoring wells V-766A and CRP-15 appeared to show some increases in concentration of several analytes

from 1991 to 1992. However, these increases appeared to be within the normal ranges of concentrations exhibited

in the past. The other three wells appear relatively uncontaminated, with TDS levels in samples about one-third,

sulfates about one-twentieth, and uranium an order of magnitude lower than concentrations in samples from

uncontaminated wells.


5.4.2.3.2 Status October 1999 (Excerpted from Umetco 1997 Five Year Review, CDPHE 1999 Uravan

Rmedial Action Status Report)

Umetco reports that monitoring wells CM93-1, CM93-2, CM93-3, V-768, and V-769, Figure 5.4.1.1-1, were

constructed to monitor the Kayenta/Wingate aquifer beneath Club Mesa. Addendum A of the RAP requires

monitoring of wells V-766, V-768, V-769, CRP-15, and CRP-16. However, none of the documents reviewed

during this Five Year Review discussed the other differences observed in the monitoring program (e.g., no

monitoring of CRP-16 and annual monitoring of CM93-1, CM93-2, and CM93-3) or that the RAP was revised

to approve the differences in the monitoring program.

As summarized in Appendix 4, concentrations of most analytes in the monitoring wells fluctuated throughout this

time period, but the concentrations were generally within the historical range of values observed during previous

sampling events. However, there were some changes of note. 1998 Monitoring well CM93-1 showed an increase

between 1994 and 1998 for TDS, iron, and zinc. Also in 1998, monitoring well CM93-2 showed decreased

bicarbonate and zinc concentrations over those seen in previous years, whereas the arsenic, chloride, iron,

manganese, sulfates, TDS, gross alpha, and polonium-228 values increased. Monitoring well CM93-3 exhibited

large increases in radium-228, natural uranium, and sodium concentration in June 1996, June 1998, and June 1998,

respectively, but these contaminants quickly returned to values within the general range of concentrations seen in

other monitoring events. The results of 1998 monitoring results for well Monitoring well V-768 had increased

concentrations of nitrate + nitrite and natural uranium, but had decreased concentrations of calcium, chloride,

sodium, sulfate, and TDS in 1998. Monitoring well V-769 showed decreased concentration of TDS, zinc, gross

alpha, and radium-226, and increased concentration of ammonia, magnesium, potassium, and radium-228 in 1998.

Wells CRP-15 and V-766A are monitored to review the effectiveness of the Hillside Seepage Collection System.

V766A showed decreased concentrations for most analytes as compared to previous results. Manganese and

radium-228 were the sole analytes that increased during 1998 in monitoring well V-766A. With the exception of

1998 results, a few analytes show a trend in increasing concentrations over time, including gross alpha and uranium.

Results for monitoring well CRP-15 didn’t show discernible general trends between 1993 and 1998 for most

analytes with the exception of ammonia, bicarbonate, and sulfates which showed general decreasing trends.

Water levels in these monitoring wells between 1993 and 1998 generally fluctuated between sampling events.

Variations of ± two to four feet were common. However, well CM93-2 showed


more than a 20-foot drop in level at the end of 1998. The reason for this large decrease in water level in CM93-2

was not explained by Umetco. None of the other wells demonstrated a similar decrease.

Table 5.4.2.3-1 summarizes the major requirements for remedial activities at the Club Mesa Kayenta/Wingate

Monitoring Wells specificed in Section 5.4.2.2 of the RAP, required completion dates as specified in Section

5.4.2.4 of the RAP, and status as of October 14, 1999.


The site visit of October 12 and 13, 1999 visually found the ground water monitoring wells installed in the Club

Mesa. Proper installation and operation of the wells could not be confirmed by visual observation.

Recommendations:

1. If monitoring well CRP-16 actually was monitoring between 1993 and 1998, these values should be placed

into the Annual Reports. Otherwise, the Annual Reports should be amended with an explanation or note

indicating why this was not sampled. Future reports should reflect the change in RAP regarding monitoring wells

CRP93-1, CRP93-2, and CRP93-3.


Table 5.4.2.3-1Club Mesa Kayenta-Wingate Sequence


Site Status 10/14/99Ongoing as of 10/14/99


the Club Mesa Monitoring Wells of the Kayenta-Wingate Sequence:S Monitoring wells shall be monitored as required in

Addendum A of the RAP, e.g., at least annually.

S The following wells shall be monitored:• V-766• V-768• V-769• CRP-15• CRP-16.

12/31/88

Annually by March 31 forthe prior calendar year

Partially completed each year as required

Partially completed each year as required

Note: CRP-16 was not monitored ad required byRAP. CM93-1, CM-93-2, and CM93-3monitored, but are not included in the RAP.

2. UCC/Umetco shall submit the compiled Club MesaKayenta-Wingate data and a brief analysis as part ofthe Annual Report.



3. A performance evaluation report of the Club Mesa

Kayenta-Wingate shall submitted to the State thatcompares the monitoring well data to past information.




Table 5.4.2.3-1

Club Mesa Kayenta-Wingate Sequence


Completion



4. A proposed long-term monitoring program shall be

submitted.


days prior to completion of

Uravan Facility remedial

activities

Not required to-date. All remedial activities at the

site have not been completed.

5. Long-term monitoring, if any, after closure of the

Uravan facility shall be conducted pursuant to the

Colorado Radioactive Materials License.

Upon closure of the

Uravan Facility

Not required to-date. The Uravan Facility has not

closed.


5.4.3 River Valley - Kayenta-Wingate Sequence

5.4.3.1 History

UCC/Umetco’s liquid waste handling and disposal operations in the river valley released contaminants into the

Kayenta-Wingate aquifer. The most significant contribution to ground water contamination was the disposal of liquid

raffinate in the unlined Club Ranch Ponds. Seepage from the Club Ranch Ponds has been found in monitoring wells

beneath and down gradient from the ponds.

The ground water system in the river valley is a complex, fractured aquifer that maintains a recharge-discharge

relationship with the San Miguel River. The monitoring well system in the river valley has measured contamination

in the fracture system. This contaminated ground water acts as a source of non-point contamination to the San

Miguel River. The sandstone matrix likely produces very little liquid relative to the fractures, and may contribute

contaminants to the fracture system at a relatively slow rate.


As stated in the RAP, the goal of the remedial activities for aquifer restoration is to remove fracture contamination

and improve ground water quality to a beneficial use. Achieving this goal, coupled with the removal of crystals and

ponded liquids from the river valley, will substantially reduce the contaminated non-point load to the river. As stated

in the RAP, this will significantly reduce the impact of the non-point load on the river quality. The remedial program

is designed to achieve this goal within seven (7) years, with up to four (4) years additional pumping.




Two new withdrawal wells and several new monitoring wells were installed in a two-phase program beginning in

1991. The second phase of well installation was performed in February and March of 1992. The original monitoring

wells for this area were determined to be improperly constructed to allow downward migration of contaminants

from the alluvium into the Kayenta Formation. Samples obtained from these wells were considered to falsely

indicate contaminant concentrations in the


bedrock of the Kayenta Formation. The report on the installation of the new wells indicates that 14 pre-existing

wells were abandoned.

The new Club Ranch Ponds wells were screened at different depths than previous wells. The completion of the

lined Club Ranch Ponds prevented ground water monitoring results to be influenced by water infiltration from the

previous unlined ponds.

Extraction wells had removed 36.4 million gallons of contaminated ground water by the end of 1992. The water

was placed into lined Club Ranch Evaporation Pond #1, #4, and #6.

Drawdown effects were noted in some monitoring wells. Some improvement was considered to be taking place

based upon availabe data. It was not considered possible to assess the effectiveness nor predict the time frame

needed for remediation. The extraction of ground water from the fractures and bedding planes of the Kayenta

Formation would remove contaminants easily, but the diffusion of contaminants out of the lower permeability matrix

of the Kayenta Formation was considered to take a much longer period of time.

From 1991 to 1992, most of the monitoring well network was replaced, including: CRP-2 through 14. Figure

5.4.3.3-1 shows the monitoring and extraction well locations. Only monitoring wells CRP-1, CRP-15, CRP-16,

CRP-17, and CRP-18 remained from the original monitoring well network. During replacement of the initial CRP

wells, five well clusters, CRP-6 through CRP-9 and CRP-19, were installed to also observe the vertical extent to

ground water contamination.



In 1994, there monitoring wells, CRP-19B, CRP-19C, and CRP-21 were added to the extraction system to

provide additional extraction capabilities to the existing wells WD1 and WD2. During the period of 1991 to 1996,

the extraction well network removed approximately 5,700 tons of dissolved solids from the Kayenta aquifer. Figure

5.4.4.3-2 shows the location of the monitoring and withdrawal wells as of March 1994.

In 1996, two new withdrawal well WD3 and WD4, were constructed. Withdrawal well WD3 was constructed

in the high permeable area near CRP-3. WD4 was constructed in the low permeable area between CRP-2 and

the San Miguel River. The wells were constructed of 6-inch PVC casing to a depth of 150 feet, with 100 feet of

screened interval. From 1997 through 1998, approximately 1,100


tons of dissolved solids were removed from the Kayenta aquifer using withdrawal wells WD1, WD2, WD3, WD4,

and converted monitor wells CRP-19A, CRP-19B, CRP-19C, and CRP-21. Figure 5.4.4.3-3 shows the locations

of the monitoring and withdrawal wells, as of October 1999.

As discussed in Section 4.2, in 1997 Umetco excavated several trenches in the old, unlined lower Club Ranch

Evaporation Ponds #2, #3, and #5. Perched liquid encountered during the excavation was collected and pumped

into the lined Club Ranch Evaporation Ponds. Approximately 980,000 gallon of water and 540 tons of dissolved

solids were removed by the trenches in 1997 and approximately 430,000 gallons of water were removed in 1998.

In 1998, four new withdrawal wells, WD5 through WD8, were constructed. In addition, four new monitor wells

were drilled, but one was abandoned prior to completion. The three monitoring wells that were completed included

CRP-24, CRP-25, and CRP-26.

At the end of 1998, the well network consisted of the following:

Monitoring Wells Constructed in the High Permeability Zone

• CRP-8A and 8B

• CRP-9A, 9B, and 9C

• CRP-19A, 19B, and 19C

Monitoring Wells Constructed in the Low Permeability Zone

• CRP-6B and 6C

• CRP-7A 7B, and 7C

• CRP-8C

• CRP-20

• CRP-21

• CRP-22

• CRP-23

• CRP-24

• CRP-25

• CRP-26

Extraction Wells Constructed in the High Permeability Zone

• CRP-3

• CRP-19B and 19C (Monitoring wells also)


• WD1

• WD2

• WD3

Extraction Wells Constructed in the Permeability Zone

• CRP-2

• CRP-21 (Monitoring well also)

• WD4

• WD5

• WD6

• WD7

• WD8

Umetco also constructed four new mointoring wells, TD981 through TD984, in 1998 to investigate trends in Point

of Compliance (POC) Well CRP-18 and to determine the down gradient extent of contamination from the Club

Ranch ponds. Well CRP-18 is located northwest of the Club Ranch Ponds at the approximate location of the

Highway Air Monitoring Station on Highway 141.

Overall, it is estimated by Umetco that ground water extraction activities from 1992 through 1998 resulted in the

removal of more than 200,000,000 gallons of contaminated ground water and 7,000 tons of dissolved solids from

the Kayenta aquifer.

Ground water monitoring was conducted as required between 1993 and 1998, with the exception of well CRP-16

which was not sampled during this period. CRP-16 was not reported by Umetco as being replaced and/or

abandoned during this period.

Appendix 5 summarize the ground water monitoring results for the River Valley Kayenta-Wingate monitoring wells.

Comparison of ground water monitoring results from 1992 through 1998 demonstrate a significant reduction on

TDS concentration due to ground water extraction activities and natural flushing of gravels in the Kayenta aquifer.

TDS concentrations in areas of high permeability decreased an average of 73 percent while TDS concentrations

in low permeability areas decreased as average of 37 percent from their historical maximum concentrations.

Average concentrations of key indicator contaminants (e.g., sulfate, ammonia, chloride, and uranium) also

decreased during this time period.


Comparison of 1992 through 1998 monitoring results also indicate a general trend towards equilibrium

concentrations of indicator contaminants. Isopleth maps of TDS concentrations throughout the Club Ranch Ponds

Area prepared for the years of 1983, 1992, and 1998 also show a reduction in lateral extent of high TDS

concentrations throughout the area and a consolidation of the higher concentrations towards central areas.

In 1999 Umetco concluded that additional pumping of the high permeability zones did not appear warranted. The

basis for this conclusion was that:

• Concentrations of TDS and other ground water contaminants had reached equilibrium concentrations

• Statistical analysis of 1998 background monitoring well and 1998 point-of-compliance monitoring well results

did not find any difference between any constituent concentrations at the 95 percent confidence limit.

• Additional contaminants requiring a background comparison had concentrations below the detection limit

• None of the contaminants with prescribed ground water protection standards exceeded their respective limits.

Umetco did consider that additional improvement of contaminant concentrations in the zones of lower permeability

could still be realized with the additional extraction wells completed in the lower permeability zones in 1998 and

implementation of Umetco’s 1998 Ground Water Optimization Program.

In the January 1998 Proposal to Maintain Optimal Ground Water System Performance, Uravan, Colorado,

Umetco demonstrated an average difference of 71 percent in areas of high permeability with a lesser reduction in

TDS concentrations in low permeability areas, e.g., an average difference of 34 percent, from historical maximum

concentrations through the second quarter of 1997. Table 5.4.3.3.2-1 compares the January 1998 data, obtained

through the second quarter of 1997, with the January 1999 data which was generated through the last quarter of

1998. Data on the percent difference compares the respective year with 1992 data.


Table 5.4.3.3.2-1

Comparison of TDS Concentrations in River Valley Wells

Maximum Concentrations, 1997 Concentrations, and 1998 Concentrations

Well Max.

TDS

1997 TDS %

Difference

(1997/Max)

4th

Quarter

1998 TDS

%

Difference

(1998/Max)

% Improvement

19997-1998

High Permeability Zone

CRP-8A 61,000 8,170 87% 4,300 93% %6%

CRP-8B 3,900 1,680 57% 1,740 55% &2%

CRP-9A 39,100 7,270 81% 8,030 79% &2%

CRP-9B 13,700 4,930 64% 4,420 68% %4%

CRP-9C 24,800 8,250 67% 5,610 77% %10%

CRP-19A 30,200 9,490 69% 9,550 68% &1%

CRP-19B 40,000 11,800 71% 11,300 72% %1%

CRP-19C 31,100 9,140 71% 8,800 72% %1%

AVERAGE 30,475 7591 71% 6,719 73% %2%

Low Permeability Zone

CRP-6B 6,590 5,940 10% 5,760 13% %3%

CRP-6C 18,600 9,430 49% 9,350 50% %1%

CRP7A 72,400 54,300 25% 47,000 35% 0.4

CRP-7B 43,600 21,100 52% 19,800 55% %3%

CRP-7C 56,200 50,200 11% 46,400 17% +6%

CRP-8C 4,080 3,300 19% 3,390 17% &2%

CRP-20 34,900 18,900 46% 21,000 40% &6%

CRP-21 40,000 26,500 34% 22,900 43% %9%

CRP-22 4,090 1,520 63% 1,260 69% %6%

CRP-23 9,000 6,180 31% 6,300 30% &1%

AVERAGE 23,888 19,737 34% 10,630 37% %3%


Although several wells in the high permeability zone either have or are approaching an equilibrium condition with

only ±1-2 percent difference between 1997 and 1998 values, a few wells e.g., CRP-8A, CRP-9B, and CRP-9C,

are still undergoing greater change of ±5-10%.

Review of the ground water monitoring results identified the following apparent inconsistencies:

• CRP-7B: Monitoring results for December 1995 and January 1996 are identical indicating an possible error in

data recording

• CRP-19B: Monitoring results for January 1996 are listed as “0", “0.00", or “0.000". Other than for the

radionuclides, it is technically impossible to have an analytical result of 0; results are typically reported as “lower

than detection limit” or similar wording

• CRP-21: Monitoring results for September 1995 and October 1995 are identical indicating an a possible error

in data recording

• CRP-21: Monitoring results for molybdenum in December 1994 and March 1995 are listed as “0.00". Other

than for the radionuclides, it is technically impossible to have an analytical result of 0; results are typically

reported as “lower than detection limit” or similar wording

• WD-2: Most monitoring results for December 1996 and March 1997 are identical indicating an possible error

in data recording

• WD-3 and WD-4: Monitoring results for November 21, 1996 and December 1996 are listed as “0", “0.00",

or “0.000". Other than for the radionuclides, it is technically impossible to have an analytical result of 0; results

are typically reported as “lower than detection limit” or similar wording

• On several occasions, the entire suite of analytes were not analyzed for these monitoring wells. Instead, “NA”or

“Not Analyzed” was recorded in the respective Annual Environmental Monitoring Report. The reason(s) for the

missing data was not explained by Umetco.

Final Construction Reports for lined Club Ranch Ponds #1, #4, and #6 have not been submitted to the State. Final

Construction Reports for lined Club Ranch Ponds #7 and #8 were submitted to the State in July 1990. Final

Construction Reports for the new ground water wells were submitted to


the State in January 1999, but Construction Reports for ground water monitoring and extraction wells completed

prior to 1999 have not been submitted to the State.

Table 5.4.3.3-1 summarizes the major requirements for remedial activities at the Club Ranch Ponds Area specified

in Section 5.4.3.2 of the RAP, required completion dates as specified in Section 5.4.3.4 of the RAP, and status



The site visits of October 13 and 14,1999 visually found the ground water monitoring wells installed in the Club

Ranch Area. Proper installation or operation of the wells could not be confirmed by visual observation.

Recommendations:

1. Final Construction Reports for lined Club Ranch Ponds #1, #4, and #6 and the ground water monitoring wells

completed prior to 1999 should be submitted to the State as soon possible.

2. Although most of the wells completed in the high permeability zone have or are reaching equilibrium levels with

no “significant” improvement and none of the contaminant concentrations exceeded their respective ground

water protection standards, three of the wells do show greater change between mid-1997 and late-1998. It

is recommended that:

S Ground water extraction from wells completed in the high permeability zones should be continued until a

statistical comparison of each well can be completed, as required in Section 5.4.3.2.3 of the RAP

S Ground water extraction from wells completed in the low permeability zones should be continued until a

statistical comparison of each well can be completed, as required in Section 5.4.3.2.3 of the RAP.

3. The analytical results for CRP-7B, CRP-21, and WD-2 should be reviewed to determine if the results were

identical. If not, they should be revised, as required.

4. Analytical results less than the analytical method’s lower limit of detection should be reported as such, rather

than as “0".

5. All required parameters should be analyzed. When this is not possible, the respective Annual Environmental

Monitoring Report should explain the discrepancy.


Table 5.4.3.3.-1San Miguel River Valley Kayenta-Wingate Sequence



1. The following work activities shall be conducted forthe San Miguel River Valley Monitoring Wells of theKayenta-Wingate Sequence:

S Monitoring wells shall be monitored as requiredin Addendum A of the RAP, e.g., at leastannually.

S Data shall be collected during the Initial SamplingProgram.

S UCC/Umetco shall submit the compiled Club MesaKayenta-Wingate data and a brief analysis as partof the Annual Report.

Within 60 days followingState approval ofmonitoring program

Within 60 days followingState approval ofmonitoring program

Annual by March 31 forthe prior calendar year


Completed.


2. The restoration program shall consist of at least two (2)withdrawal wells:S Constructed in the areas of highest concentration of

TDS in the vicinity of the Club Ranch PondsS Completed in the zone of maximum contaminant

concentrations in the fractured part of the aquiferS Designed to produce at least 30 gallons per minute.

12/31/91 Completed.

Extraction wells were constructed initially in 1991,with additional wells constructed in 1996.

Table 5.4.3.3-1San Miguel River Valley Kayenta-Wingate Sequence



3. Discharge from each well shall be pumped to linedevaporation ponds constructed in the Club RanchPonds Areas after the area has been cleaned.

12/31/91 Completed.

Extracted ground water pumped to lined ClubRanch Ponds beginning in 1991.

4. The wells shall be pumped continuously orintermittently to optimize contaminant withdrawalfrom the aquifer an annual average pumping rateof approximately 60 gallons per minute or othersuch rate determined to be necessary.

At all times duringrequired operation of thesystem

Ongoing.

5. Pumping of the wells shall continue untilperformance criteria stated in the RAP are met.

Until ground waterquality meetsagricultural use criteria,the performance of theaquifer system no longershows significantimprovement, or theoperating for eleven (11)years

Ongoing.

6. A ground water monitoring and data collectionprogram shall be established according toAddendum A of the RAP.

Within 120 days afterexecution of ConsentDecree

Ongoing.





7. A performance evaluation report of the San MiguelRiver Valley Kayenta-Wingate withdrawal systemshall be submitted to the State.

Not later than ninety (90)days after the end of twoyears of ground waterremoval and then annuallyby March 31 for the priorcalendar year

Completed.

8. A Final Construction Report shall be submitted tothe State.

Not later than ninety (90)days after installation orconstruction of the linedClub Ranch Ponds andinstallation of anymonitoring or withdrawalwells

FINAL CONSTRUCTION REPORTS FORTHE LINE CLUB RANCH PONDS # 1, #4,AND #6 AND GROUND WATERMONITORING AND EXTRACTION WELLSCOMPLETED PRIOR TO 1999 HAVE NOTBEEN SUBMITTED TO STATE ASREQUIRED BY THE RAP.

Final Construction Reports for lined ClubRanch Ponds #7 and #8 were submitted to theState in July 1990.

Final Construction Reports for the new groundwater wells were submitted to the State inJanuary 1999.





9. A Certification Report shall be submitted to the State. Not later than 120 daysafter completion ofremedial activities at theUravan Facility

Not required to-date All remedial activities atthe site have not been completed.

10. A proposed long-term monitoring program shall besubmitted

Not later than ninety(90) days prior tocompletion of UravanFacility remedialactivities

Not required to-date. All remedial activities atthe site have not been completed.

11. Long-term monitoring and maintenance of theHillside Seepage Collection System

Pursuant to the ColoradoRadioactive MaterialsLicense.

Not required to-date. All remedial activities atthe site have not been completed.



6.0 MISCELLANEOUS REMEDIAL ACTION PLAN REQUIREMENTS

6.1 Off-Site Dose Limits

6.1.1 Requirements

UCC/Umetco shall conduct remedial activities in such a manner as to provide reasonable assurance that the annual

radiation dose equivalent of 25 millirems (mREM) to the whole body, 75 mREM to the thyroid, and 25 mREM to

any other organ of any member of the public is not exceeded as the result of exposures of radioactive materials,

radon and its progeny excepted, to the general public.


The objective is to protect the public from excessive exposure to ionizing radiation released from the Uravan

Facility.




All data were far below the Atomic Energy Act standard of 25 millirern per year whole body dose. The dose to

the nearest residence was calculated to be 0.004 millirern per year.



Review of data from the 1994 through 1998 Annual Reports indicate that the nearest residential site received an

annual ionizing radiation dose less than the annual Total Effective Dose Equivalent (TEDE) of 100 mREM, as

regulated by the Colorado Rules and Regulations (CCR), Standards for Protection Against Radiation, 6 CCR

10007-1, Part 4. The annual Total Effective Dose Equivalent to the nearest resident was 2.55 mREM in 1994, 23.8

mREM in 1995, 96.1 mREM in 1996, and 61 mREM in 1998, The data indicates a trend of increased dose to

nearest resident during the period of 1994 through 1998. Umetco considered that the primary contributors of the

total dose was radon-222 and its progeny. However, Umetco considers these values to be conservative estimates

of the


actual dose of the nearest imparted by the Uravan Superfund Site, as the nearest resident lives more than 6 miles

south of the site.

Table 6.1.3-1 summarizes the major requirements for remedial activities associated with Off-Site Dose Limits

specified in Section 6.1 of the RAP and status as of October 14, 1999.


The site visits of October 13 and 14, 1999 observed the Tabeguache (background), TP-2, Club Mesa, and

Atkinson Creek air monitoring stations. The background station was located approximately one to two miles east

of the site. Other than the radon track etch monitors, this monitoring station was located behind a fence and visually

appeared to be well set-up and maintained. The remainder of the stations were also behind fences.

Recommendations:

1. Umetco should undertake air modeling of the site, including the background and nearest neighbor monitoring

stations, to more scientifically determine the potential exposure of the nearest resident to sources of ionizing

radiation released from-the Uravan Superfund Site.

Table 6.1.3-1

Off-Site Dose Limits


Completion




the Off-Site Dose Limit monitoring:

S an annual report shall be prepared that evaluates

doses to off-site individuals and populations and

indicates whether the statutory doses are exceeded.

The evaluation shall also include details of natural

background radiation and of past and present

uranium fuel cycle of other operations that have

contributed or could contribute to radiation doses

above those from natural background radiation

values. The evaluation shall also include an up-to-

date inventory of sources other than authorized by

the site’s radiation license issued by the State that

could reasonably be expected to affect compliance

with the prescribed dose limits.

Annually Completed each year as required.


Table 6.1.3-1

Off-Site Dose Limits


Completion



A topographic map shall be included in the report that

shows the locations of the sources within five (5) miles of

the site’s controlled boundary.

S UCC/Umetoc shall ensure that no garden produce is

grown for human consumption on the Uravan

Facility.

S UCC/Umetco shall cause all present residences of the

Town of Uravan to vacate their residences by

December 31, 1986. No building or improvements

shall be constructed for or occupied as a residence.

At all times Completed and ongoing

Completed



6.2 Health, Safety, and Environmental Procedures

6.2.1 Requirements

UCC/Umetco shall maintain and conduct remedial activities in accordance with comprehensive written health,

safety, and environmental procedures manuals, approved by the State. The procedures manuals shall contain safety,

monitoring, decontamination, and emergency procedures.


The objective is to protect site workers from excessive exposure to ionizing radiation released from the Uravan

Facility and from other site occupational safety and health hazards.




Status of this requirement not addressed specifically in the previous EPA Five Year Review.



UCC/Umetco maintains internal health and safety policies and programs addressing radiation safety, industrial

hygiene procedures, respiratory protection, healing protection, etc. These programs and policies are, in general,

at least as restrictive as U.S. Department of Labor - Occupational Safety and Health Administration (OSHA),

Nuclear Regulatory Commission (NRC), and State regulations. These policies and procedures are routinely audited

by QC/QA personnel within Union Carbide Corporation, of which Umetco is a wholly-owned subsidiary. In

general, these policies and procedures were written between 1988 and 1998. The respiratory protection program

was revised in 1998 to reflect changes in the OSHA respiratory protection standard.

In addition to the health and safety policies and procedures, UCC/Umetco has prepared a Site Safety and Health

Plan (SSHP), required by OSHA regulation 29 CFR 1926.65, for this Superfund Site. The current SSHP was

revised in 1998 and addresses the requirements of the OSHA hazardous waste site health and safety regulation.


Table 6.2-3-1 summarizes the major requirements for remedial activities associated with Health, Safety, and

Environmental Procedures specified in Section 6.2 of the RAP and status as of October 14, 1999.


The site visits of October 13 and 14, 1999 found all procedures readily available. A copy of the Hazard

Communication Program, with an up-to-date chemical inventory and applicable material Safety Date Sheets

(MSDSs), was also readily available.

Recommendation:

1. None noted.


Table 6.2.3-1

Health, Safety, and Environmental Procedures


Completion


Completed as required as of 10/14/99

1. The following work activities shall be completed for

the Health, Safety, and Environmental Procedures:

S Administrative and operating procedures

relating to radiological health and safety

S Instructions and precautions to keep exposures

as Low as Reasonably Achievable (ALARA)

S Specific information on analytical equipment,

laboratories, and procedures for each aspect of

the monitoring program

Not specified in the RAP



Completed.

Completed.

Completed.


6.3 Area Source Air Emission Controls

6.3.1 Requirements

UCC/Umetco shall implement dust control procedures as approved by the Sate, in accordance with the Quality

Plan.


The objective is to protect site workers, neighboring properties, and the environment from excessive exposure to

airborne dusts contaminated with radionuclides released from the Uravan Facility.


6.3.3.1 Status December 1993 (Excepted from EPA 1993 Five Year Review, Umetco 1997 Five-Year Review,


Status of this requirement not specifically addressed in the previous EPA Five-Year review.



Control of fugitive dust is governed by Uravan Policy and Procedure E-12 Fugitive Dust Control Plan. This plan

requires watering of all disturbed areas a minimum of twice per day to maintain a surface moisture of five percent

or greater; compaction of deposited tailings to specified Proctor densities, re-seeding of areas left undisturbed for

six months or unless they naturally re-vegetate before six months; restriction of vehicles before leaving the restricted

area; stopping work when wind speeds continuously exceed 40 miles per hour; and control of mud and dirt

carryout onto paved roads.

Umetco publishes the volume of water used for fugitive dust control in the Quarterly Progress Reports. For

example, approximately 24.9 million and 5.6 million gallons of water were applied on the Uravan site for dust

control purposes in 1998n and through the first three quarters of 1999, respectively.


A review of Total Suspended Particulate (TSP) monitoring results and corresponded between Umetco and the Air

Pollution Control Division of the CDPHE determined that Umetco was generally in compliance with permit

conditions listed in Emission Permit No. 88M0020F. However, several instances of exceedences of the 24-hour

135 microgram per cubic meter (Fg/m3) TSP action level were identified. In 1998, Umetco attributed the several

exceedences to the DOE subcontractor placing Title 1 UMTRA materials into the Upper Burbank Repository. This

subcontractor was not exceedences.

Table 6.2.3-1 summarizes the major requirements for remedial activities associated with Area Source Air Emissions

Controls specified in Section 6.3 of the RAP and status as of October 14, 1999.


Visual observations during the site visits of October 13 and 14, 1999 determined the fugitive dust control practices

to be effective. Large, continuous dust clouds released from any part of the site were not observed during the

two-day audit. Speed limit signs restricting vehicle traffic to less than 20 mph around the site were posted. A water

truck was traveling around the site applying water to unpaved roads.

Recommendations:

1. It is recommended that, whenever practicable, additional applications of water or amended water solutions be

applied to the site when high winds are predicted and/or experienced at the site.


Table 6.3.3-1Area Source Air Emission Control

RAP Requirement Required Date ofCompletion

Site Status 10/14/99Ongoing as required as of 10/14/99

1. The following work activities shall be completed forArea Source Air Emissions Control:S Dust control procedures shall be implemented for

Residue Storage Areas as approved by the State,in accordance with the Quality Plan.

S Dust control procedures shall be implemented forcontrolled area roads by sprinkling or chemicalcrusting agents and shall limit vehicle speeds totwenty (20) miles per hour.

S Dispersion of airborne particulates from thetailing disposal area shall be minimized to theextent possible according to a plan approved bythe State.




Completed

All residue storage areas have been removed as of10/14/99.

Ongoing

Dust control for roads is effected through theapplication of water dispersed from water trucks.Speed limits are set at twenty (20) miles per hour.

Ongoing

The necessity for dust control on Tailing Pile #3 isminimal, as the final cover, except for the ripraparmor, is complete. Dust control on Tailing Pile#1/2 is effected through compaction of thematerials.


6.4 Personnel and Facility Monitoring

6.4.1 Requirement

UCC/Umetoc shall monitoring personnel and the facility in such a manner as to enable the State to estimate the

maximum potential occupational radiation dose commitment and to determine compliance with 6 CCR 1007-1-4,

in accordance with a written plan approved by the State. The monitoring results shall be reported to the State and

presented in such a tabular and graphical from that trends may be readily identified. Personnel monitoring control

badges shall be kept in a background location.


The objective is to protect site workers from excessive exposure to radionuclides to which they are exposed while

working at the Uravan Facility.




Status of this requirement not addressed in the previous review.



Occupational monitoring of Umetco and subcontractor personnel is performed to estimate internal and external

dose from ionizing radiation resulting from work on the Uravan site. Dose determination methodologies are radiation

resulting from work on the Uravan Policy and Procedure R-1, Personnel Dose Determination, approved by

CDPHE.

External exposures to ionizing radiation are determined through the use of thermoluminescent dosimeters (TLDs).

Every individual working on the site has a personal TLD that is capable of measuring deep dose equivalent, eye

lens dose equivalent, and shallow dose equivalent. TLDs are changes quarterly.


Internal doses to gross alpha ionizing radiation are determined from breathing zone samples of personnel working

at the site. Breathing zone samples are collected weekly from at least two individuals from each exposure group.

For jobs requiring a Radiation Work Permit, breathing zone samples are collected daily until the job is completed.

Urine samples are collected from each person and analyzed for natural uranium and radium-226 according to the

following schedule: 1) when first hired, 2) quarterly, 3) termination, and 4) special circumstances.

Exposure monitoring results review from the 1994 through 1998 Annual Reports indicated that all personnel

working on site during these years received less than 20 percent of the Total Effective Dose Equivalent (TEDE)

of 5 rem or 1 rem. Most results were far below this value.

Table 6.4.3-1 summarizes the major requirements for remedial activities associated with Personnel and Facility

Monitoring specified in Section 6.4 of the RAP and status as of October 14,1999.


The site laboratory was visited during the site visits of October 13 and 14, 1999. Visual observations of the

laboratory found it to be well organized and clean. Air monitoring records were in good order and records could

be found quickly.

Recommendations:

1. None noted.


Table 6.4.3-1

Personnel and Facility Monitoring


Completion


Ongoing as required as of 10/14/99


Personnel and Facility Monitoring:

S UCC/Umetco shall comply with the program as

in the Procedures manual approved by the

Colorado Department of Health and NRC

Regulatory Guide 8.22.

S Urinalysis for uranium shall be performed for

employees assigned to Radiation Work Permit

activities exceeding one work day. Specimens

shall be collected as close as is reasonably

possible to the period beginning 48 hours and

ending 96 hours after the latest exposure. The

measurement sensitivity shall be 5 microgram

per liter (Fg/L) or less. UCC/Umetco shall

make a formal documented exaluation if

bioassay measurements exceed specified

criteria.



Completed.

Ongoing.


Table 6.4.3-1



Completion


Dispersion of airborne particulates from the tailings

disposal area shall be minimized to the extent possible

according to a plan approved by the State.

S UCC/Umetco shall conduct an air sampling

program to assess radioactivity concentrations to

which employees may be exposed as follows:

• A representative air sample for no less

than 30 minutes shall be collected at least

quarterly at specified work stations

approved by the State to determine

airborne uranium concentrations.

• Breathing zone sampling shall be

completed at least quarterly to determine

the representativeness of the station air

samples.• Monthly air samples for no less than 30

minutes duration, representative of

potential employee exposure shall be

collected at activity and storage locations

to determine airborne uranium

concentrations.





Ongoing.

Ongoing.

Ongoing.

Ongoing.

S

Ongoing.


Table 6.4.3-1


RAP Requirement Required Date of Completion Site Status 10/14/99

C Sampling at selected work area shall

be performed at least monthly to

determine radon daughter

cocentrations. If these values exceed

25 percent of the applicable

standards, the frequency of sampling

shall be increased to weekly.

C If the air sampling program reveals

work activity locations where

concentrations exceed 25 percent of

the applicable standards,

UCC/Umetco shall establish a

procedure to determine time-weighted

exposures of employees working at

these loactions.



Ongoing.

Ongoing.


Table 6.4.3-1Personnel and Facility Monitoring



• In-plant air monitoring committed to in theColorado Radioactive Materials License,Conditions 11.2 or 11.3, shall beperformed under conditions typical ofemployee exposure.

Not specified in the RAP Ongoing.

• Along with results of airborne activity,UCC/Umetco shall keep a record of theactivity during sampling.


• UCC/Umetco shall maintain records of anyrespirator maintenance, fit and trainingprograms.



6.5 Facility Alpha Contamination Sampling

6.5.1 Requirements

UCC/Umetco shall perform documented spot surveys for alpha contamination at least quarterly on ten (10) percent

of the workers leaving the facility. Alpha contamination on skin or clothes exceeding 1000 disintegrations per minute

per 100 square centimeters (dpm/100 cm2) shall require decontamination and an investigation by the Radiation

Safety Officer (RSO) as to the cause.


The objective is to protect site workers from excessive exposure to alpha contamination to which they may be

exposed while working at the Uravan Facility.







A review of RSO monthly reports for 1998 found that alpha surveys are conducted in eating areas of the break

trailer, in the office, and of at least 10 percent of personnel leaving the job site for a specified day of each month.None of the reports indicated results above the specified action level of 1000 dpm/100 cm2.

Table 6.5.3-1 summarizes the major requirements for remedial activities associated with Off-Site Dose Limits

specified in Section 6.4 of the RAP and status as of October 14, 1999.


The site visits of October 13 and 14, 1999 did not identify anything of note.

Recommendations:

1. None noted.


Table 6.5.3-1Facility Alpha Contamination Sampling


Completion



1. The following work activities shall be completed for Personnel and Facility Monitoring:

– UCC/Umetco shall conduct alpha contamination

surveys of the lunch rooms, control rooms, changerooms, and offices at least monthly.

Not specified in the RAP Completed and ongoing as required as of

10/14/99.

– If the surveys reveal contamination levels that

exceed CDPHE guidelines, the area shall bedecontaminated immediately, an investigation shall

be made by the Site Manager to determine the

cause and corrective measures required to prevent

a recurrence, and the location shall be surveyed

weekly until four consecutive weekly surveys are

below guidelines at which to time the survey

frequency shall revert to monthly.

Not specified in the RAPOngoing as required as of 10/14/99.

There were no exceedences of CDPHE guidelines

requiring decontamination of acilities or

investigations.


6.6 Environmental Monitoring and Analysis Program

6.6.1 Requirements

UCC/Umetco shall conduct an environmental monitoring and analysis program in such a manner as to enable the

State to estimate maximum potential radiation dose commitment to individuals and populations off-site and to

determine compliance with RAP Section 6.1 (Off-Site Dose Limits), in accordance with a written plan approved

by the State.


The objective is to protect off-site individuals and populations from excessive exposure to radionuclides released

from the Uravan Facility.







Ambient Air Monitoring

Environmental monitoring is conducted at six sites in and around the Uravan facility, Figure 6.6.3-1. Monitoring ofexternal radiation is conducted using TLDs. Monitoring to determine public internal exposures to ionizing radiation

is conducted by monitoring for radon concentrations using track etch detectors, and for airborne particulates using

high volume air monitors with appropriate filters. Track etch detectors were exchanged on a quarterly basis. High

volume air sampling filters are analyzed for long-lived radionuclides including natural uranium, radium-226, and

thorium-230. It is important to note that the RAP also requires air samples to be analyzed for lead-210. Up to July

1998, filters were composited for analysis on a monthly basis. In September 1998, the Colorado Radioactive

Materials License was amended to permit quarterly composites of air filters. Beginning in July 1998, air sample

filters were composited on a quarterly basis.


The types of air ambient air monitoring conducted at each of the six sites are as follows:• Tabeguache (background): TLD, radon, long-lived radionuclides

• West #2 Pile: TLD, radon, long-lived radionuclides

• Nearest Resident: TLD, radon, long-lived radionuclides

• Atkinson Creek: TLD, radon, long-lived radionuclides

• Club Mesa: TLD, radon, long-lived radionuclides

• Clarifier: TLD, radon, long-lived radionuclides

Radon was also monitored at the following locations: Point Judith, Gas Meter, West of Club Ranch Ponds #7 and

#8, and the B-Block.

Results of the monitoring are included in Section 7.0 of this document.

Ground Water

Ground water samples were collected as required between 1994 and the third quarter of 1999 of monitoring wells

completed in Club Mesa Salt Wash Member of the Morrison Formation, the Club Mesa - Kayenta/Wingate

Sequence, and the River Valley - Kayenta/Wingate Sequence.

Ground water monitoring results for the Club Mesa Salt Wash Member of the Morrison Formation, the Club Mesa

- Kayenta/Wingate Sequence, and the River Valley - Kayenta/Wingate Sequence are included in Sections 5.4.1.3,

5.4.2.3, and 5.4.3.3 of this document, respectively.

Surface Water

Surface water samples were collected as required between 1994 and the third quarter of 1999 of surface water

related to the Hillside Collection System, the Tailings Pile Toe Drain Systems, Runoff Collection System, the Club

Ranch Ponds, and the San Miguel River (including aquatic bioassay monitoring).

Surface water monitoring results for the Hillside Collection System, the Tailings Pile Toe Drain Systems, Runoff

Collection System, the Club Ranch Ponds, and the San Miguel River are included in Sections 5.1.1.3, 5.1.2.3,

5.3.3, and 7.8 of this document, respectively.

River Sediments

River sediments were sampled annually between 1994 and 1997 at five stations along the San Miguel and Dolores

Rivers. In 1998, the CDPHE amended Colorado Hazardous Materials License 660-02 and removed the

requirement for sediment sampling of the San Miguel River. No sediment


samples were collected in 1998. Samples were analyzed for natural uranium, thorium-230, radium-226, and lead-

Results of the monitoring are included in Section 7.3.1 of this document.

Surface Soils

Surface soils were collected annually between 1994 and 1998 at the six aor monitoring stations, Figure 6.6.3-1,

except 1994 in which the clarifier location was not sampled. Analytical parameters or the soil samples appeared

to vary from year-to-year. For example, in 1994 and 1995, samples were analyzed for natural uranium, radium-

226, thorium-230.In 1996, soil samples were analyzed for natural uranium, radium0226, thorium-230, and lead-

210. In 1998, soil samples were analyzed only for radium-226.

In 1998, the CDPHE amended Colorado Hazardous Materials License 660-02 and removed the requirement for

soil sampling.

Results of the monitoring are included in Section 7.3.2 of this document.

Procedure Review

All radiological health and environmental procedures were reviewed by Umetco before March 22, 1998. Revisions

to certain procedures were expected to be submitted to the CDPHE for approval in 1999.

A review of environmental procedure implementation by site personnel was conducted by Umetco in 1998. Several

deviations were identified and action plans developed and implemented.

Table 6.6.3-1 summarizes the major requirements for remedial activities associated with the Environmental

Monitoring and Analysis Program specified in Section 6.4 of the RAP and status as of October 14, 1999.

Areas of Non-Conformance

Areas of non-conformance with either the RAP or Colorado Radiological Materials License Conditions included:

• Not changing out high-volume air sample filters on a weekly basis

• Missed quarterly ground water sampling events

210.



Air monitoring stations at TSP-2, Tabeguache, Atkinson Creek, and Club Mesa were observed during the site visits

of October 13 and 14, 1999. The stations appeared to be well setup. The types of monitoring devices required for

each site were confirmed to be in place. Each air monitoring station was located inside a locked wire mesh fence.

6.6.5 Photographs

Photos 6.6.5-1 through 6.6.5-5 show four of the air monitoring stations as of October 14, 1999. Photo 6.6.5-1

shows the TSP-2 air monitoring station at the north end of the site, in the approximate vicinity of the Town Dump.

Note the uranium mines visible in the background of the photograph. Photos 6.6.5-2 and 6.6.5-3 show the

Tabeguache background air monitoring station, including the radon track etch detectors. Photo 6.6.5-4 shows the

Club Mesa air monitoring station, while Photo 6.6.5-5 shows the Club Mesa station.

Recommendations:

1. None noted.

f:\beck\RAC\Ura5-yr3.wpd -166- [03/13/00]

Table 6.6.3-1Environmental Monitoring and Analysis Program


Completion




the Environmental Monitoring and Analysis Program:

– Air particulates shall be:• Monitored at the locations specified for Plant

Operations at Uravan, at least one nearest

feasible residence, and at a control location

• Collected with weekly filter changes or more

frequently as required be dust loading

• Composited monthly by location • Analyzed for natural uranium, thorium-230,

radium-226, and lead-210.





Completed and ongoing as of 10/14/99.




– Ambient radon shall be monitored at the locations

specified in the Procedures Manual for Plant

Operations at Uravan continuously of at least once

per month, representing approximately the same

period each month.

Not specified in the RAP Completed and ongoing as of 10/14/99.

– Ground water, surface water, river sediments,

surface soils, and beta/gamma contamination

surveys shall be monitored in accordance with the

other provisions of Chapters 4.0 and 5.0 of the

RAP.

Not specified in the RAP Completed and ongoing as of 10/14/99.


7.0 COLORADO RADIOACTIVE MATERIALS LICENSE REQUIREMENTS

7.1 Meteorology

Weather observations at the Uravan site have been performed by Umetco Minerals Corporation personnel since

1972. The site maintains a weather monitoring station that records daily minimum and maximum temperatures and

precipitation. These data are supplemented by data from the National Climatic Data Center. Monitoring of wind

speed and direction ceased in 1987 with approval of the CDPHE.

7.1.1 Precipitation

The average annual precipitation for the period of 1961 through 1998 was 12.33 inches. Annual precipitation

between 1994 and 1998 ranged from 9.08 inches in 1994 to 14.47 inches in 1995.

7.1.2 Temperature

The temperature range for the period of 1961 through 1996 was -23E to 110EF. The mean annual temperature

between 1994 and 1998 ranged from 54E to 55EF. The low temperature ranged from -4E to 5EF, while the high

temperature ranged from 105E to 107EF during the period of 1994 through 1998.

7.2 Stack Emission Quality

The mill was inoperative throughout the period of 1994 through 1999 and no emissions were generated.

7.3 River Sediment, Soils, Vegetation, and Grazing Uptake Monitoring

7.3.1 River Sediment

River sediment monitoring results from 1994 through 1997 indicated that concentrations of natural uranium,

thorium-230, radium-226, and lead-210 at all five monitoring stations were generally equal, ranging from 1 to 4

pCi/L. No discernible trends were noted.


In 1998, the CDPHE amended Colorado Hazardous Materials License 660-02 and removed the requirement forsediment sampling of the San Miguel River. No sediment samples were collected in 1998.

7.3.2 Soils

Between 1994 and 1998, soil samples were collected at the six air monitoring stations, e.g., Tabeguache

(background), Clarifier, Club Mesa, West Tailings Pile #1-2, Atkinson Creek, and the nearest resident, Figure

6.6.3-1. However, in 1994 the clarifier sample was not collected. The reason for the lack of sample collection in

1994 was not explained in the Annual Report.

Monitoring results from 1994 through 1998 indicated that concentrations of natural uranium, thorium-230,

radium-226, and lead-210 at the reclaimed areas in both surface (0-5 cm depth) and subsurface (5-10 cm depth)

were generally approaching background values.


soil sampling. Soil samples were collected and analyzed in 1998 before the license was amended.

7.3.3 Vegetation

Forage samples were collected between 1994 and 1998 at the Tabeguache, Atkinson Creek, Club Mesa, and

Clarifier air monitoring locations, except in 1994 when the Clarifier location was not sampled. These samples were

analyzed for natural uranium, radium-226 and lead-210. General trends indicated relatively constant radionuclide

concentrations at all of the sampling locations and are comparable to values at the Tabeguache background

location. Some variation is noticeable, but may be attributable to differential uptake by certain plant species and

to sampling errors for the vegetation data.


vegetation sampling. Vegetation samples were collected and analyzed in 1998 before the license was amended.


7.3.4 Grazing Uptake

Between 1994 and 1997, meat samples were collected from local ranchers who stated that the animals had grazed

in and around the Uravan area. Samples collected in 1994 had no detectable concentrations of radionuclides and

no significant changes from the sample results of the last sampling effort of 1990. The error for the samples collected

in 1995 and 1996 were very large, indicating the laboratory had matrix problems.


grazing uptake sampling. No meat samples were collected in 1998.

7.4 Tailings Piles #1-2,3, and the Burbank Repository

Tailings Piles #1-2 and 3 were monitored between 1994 and 1998 for lateral movement, settlement, phreatic levels,

and drainage.

7.4.1 Tailings Pile #1-2: Lateral Movement

At the end of 1998, the maximum cumulative movement to-date, as determined by measurement of surface

movement monuments, was 1.97 feet at Monument MP-16. The maximum cumulative horizontal movement

measured to date is 0.67 feet in a northeasterly direction at Monument MP-11. Figure 7.4.1-1 shows the movement

monuments for Tailings Piles #1-2 and #3.

7.4.2 Tailings Pile #3: Lateral Movement

At the end of 1998, the maximum cumulative movement to-date, as determined by measurement of surface

movement monuments, was 0.84 feet at Monument MM-92-5. The maximum cumulative horizontal movementmeasured to date is 0.40 feet in a northeasterly direction at Monument MP-5A. The general directional trends of

horizontal measurements of Tailings Pile #3 indicate that slightly more settlement is occurring near the sandstone

abutments where the tailings slimes were deposited. Figure 7.4.1-1 shows the movement monuments for Tailings

Piles #1-2 and #3.

7.4.3 Burbank Repository: Lateral Movement

At the end of 1998, the maximum lateral movement to-date is less than 0.2 foot and the directions of lateral

movement from original positions are generally random.


7.4.4 Tailings Pile #1-2: Settlement

At the end of 1998, Tailings Pile #1-2 had settled 9.15 feet in the northen section and 6.44 feet in the southern

section since 1987. Umetco reports that the settlement rate of this tailing pile is predominantly influenced by

surcharge loading from the ongoing placement of materials. Figure 7.4.4-1 shows the locations of the settlement

monuments for Tailings Piles #1-2 and #3.

7.4.5 Tailings Pile #3: Settlement

Between 1987 and the end of 1998, Tailings Pile #3 had settled a maximum of 3.45 feet and 4.36 feet, as measured

on the south and north parts of the pile, respectively. Settlement of Tailings Pile #3 is reported by Umetco to be

due to secondary settlement. Figure 7.4.4-1 shows the locations of the settlement monuments for Tailings Piles #1-2

and #3.

7.4.6 Burbank Repository: Settlement

By the end of 1998, the settlement rate of the Burbank Repository has decreased to approximately 0.06 foot per

year, with a maximum settlement to-date of 0.79 foot.

7.4.7 Tailings Pile #1-2: Phreatic Level

Six piezometers measuring phreatic level are located in the top of Tailings Pile #1-2, and 14 piezometers, are

located on the side of Pile #1-2. Three of the piezometers located on the side of the pile became blocked between

1994 and 1998. The phreatic levels in all piezometers fluctuated between 1994 and 1998. The phreatic level of

the piezometers located in the top of the tailings pile increased an average of 1.7 feet while the phreatic level of the

piezometers located on the side of the tailings pile decreased an average of 0.5 feet during this time period. Thephreatic levels in the seventeen operational piezometers decreased an average of 0.3 feet showing that the tailings

pile was dewatering very slowly between 1994 and 1998. Figure 7.4.7-1 shows the piezometer locations for

Tailings Piles #1-2 and #3.

7.4.8 Tailings Pile #3: Phreatic Level

A detailed geotechnical investigation of Tailings Pile #3 concluded that the tailings were saturated in the lower 20

to 30 feet of the pile at the end of 1998.


7.4.9 Burbank Repository: Phreatic Level

No liquid was measured in the standpipe in the collection sump at the toe of the Burbank Repository at the end of

1998.

7.4.10 Tailings Pile #1-2 and 3: Drainage

Drainage rates for Tailings Piles 1-2 and 3 are discussed in Sections 5.1.1.3 and 5.1.2.3 of this document.

7.5 Rim Erosion Monuments

No noticeable erosion or cliff retreat was reported at the locations of the rim monuments. The 1994 through 1998

Annual Reports varied from six to eleven monuments that were included in the survey. The 1998 Annual Report

reported that five monuments were removed from service to facilitate reclamation. However, the date(s) that these

monuments were removed from service was not indicated in any of the Annual Reports. The monuments remaining

in service at the end of 1998 include EM-1, EM-3, EM-4, EM-7, EM-8, and EM-9.

Umetco requested in 1998 that monitoring of the rim erosion monuments be discontinued and instituted as part of

the long-term surveillance program. This request was approved by CDPHE. Rim monitoring will be discontinued

in 1999 but will be addressed in the long-term surveillance of the site.

7.6 National Pollutant Discharge Elimination System (NPDES) and Storm Water Management Plan

Permits

NPDES permits were terminated in 1988. No discharges occurred during the period of 1994 through October

1999 that required a NPDES permit.

A Storm Water Management Plan for the Upper Club Mesa Borrow Area was implemented in November 1993.

An annual report was submitted to the Water Quality Control Division of the CDPHE as required for each year.


7.7 Surface Water Monitoring

7.7.1 Club Ranch Ponds Water Balance

Reported in Section 7.14 of this report.

7.7.2 Runoff Collection Monitoring

Runoff Collection Ponds RC-1, RC-2, RC-3, and RC-4 were monitored during the period of 1994 through 1998.

Analytical results from water samples collected from these ponds did not identify any significant changes in chemical

composition. Metals, radionuclide, and TDS were within the range of previous results. There were some minor

variations noted for TDS and sulfates during this period.

7.7.3 Hillside Seepage Collection Monitoring

Hillside Seepage Collection Monitoring and the Toe Drain Collection System are discussed in detail in Section 5.1.1

and 5.1.2 of this report, respectively.

7.8 San Miguel River Water Monitoring

Water samples were collected quarterly from six collection stations on the San Miguel River. Stations 1 and 2 are

upstream of the Hillside Seepage Collection System. Station 3 is located in the central, downgradient area of the

Hillside Seepage Collection System. Stations 4 and 5 are downgradient of the collection system. Station 6 is

downgradient of the Uravan facility.

None of the Annual Reports actually present a statistical basis for Umetco’s contention that there are no long-termdiscernable trends in the surface water quality attributable to the Uravan facility.

Recommendation:

1. A statistical analysis of surface water quality trends should be conducted and included in the next Annual

Report.

7.9 Aquatic Bioassay Monitoring

Semi-annual algae and macroinvertebrate samples were collected from the San Miguel River. Samples were

analyzed for radionuclides and metals. The data are highly variable and no noticeable


trends were identified by Umetco. Increased uranium and radium concentrations were found in both algae and

macroinvertebrates was detected in the first half of 1995. Umetco attributed these results to analytical or sampling

errors. It is noted that a similar finding for the April 1992 sampling event was reported in the EPA 1993 Five-Year

Review.

None of the Annual Reports present a statistical basis for Umetco’s contention of no adverse effects of the Uravan

site on aquatic organisms.

Recommendation

1. A statistical analysis of the bioassay monitoring should be conducted and included in the next Annual Report.

7.10 Ground Water Monitoring

7.10.1 Club Mesa - Salt Wash Monitoring Wells

Monitoring results for the Club Mesa Salt Wash monitoring wells is discussed in Section 5.4.1.3 of this document.

7.10.2 Club Mesa - Kayenta/Wingate Sequence Monitoring Wells

Monitoring results for the Club Mesa - Kayenta/Wingate Sequence monitoring wells is discussed in Section 5.4.2.3

of this document.

7.10.3 San Miguel River Valley - Kayenta/Wingate Sequence Monitoring Wells

Monitoring results for the San Miguel River Valley - Kayenta/Wingate Sequence monitoring wells is discussed in

Section 5.4.3.3 of this document.

7.11 ALARA and Off-Site Radiation Dose Monitoring

7.11.1 Umetco Site Personnel

Exposure of Umetco and Umetco site subcontractor personnel is discussed in detail in Section 6.4 of this report.


7.11.2 Off-Site Radiation Doses

Off-site radiation doses are discussed in detail in Sections 6.1 and 6.3 of this report.

7.12 Land Use Survey

Recreational activities in the area include fishing, camping, hunting, and rafting. Land in the area is also used for

spring, fall, and winter grazing for cattle. Cattle in this area belong to Wiemer Ranches of Nucla, Colorado. No milk

or dairy cattle are grazed in the area. Active mining in the area remains on standby. However, there was evidence

of mine maintenance activities by Cotter Corporation and mine reclamation by Umetco’s Mine Reclamation Group.

A small rock quarry is operating five miles southeast of the Uravan facility, near the nearest resident location. In the

1996 Annual Report, Umetco reported that a gold placer mining operation was started approximately 3.2 miles

downstream of the Uravan operation. This operation employed two to three persons in 1995. This operation was

not noted in the 1998 Annual Report. There are no irrigated farm lands or domestic water wells located within 5

miles of the Uravan facility.

7.13 Sediment Catchment Monitoring

Sediment catchment basins were monitored for accumulation of sediment. Traps were cleaned and maintained on

an as-needed basis. Sediment removed from the traps was placed on Tailings Pile #1-2.

7.14 Water Balance Report

The Club Ranch Evaporation Ponds water balances for 1994 through 1998 showed fluctuations due to variations

in the quantity of hillside and toe drain seepage, surface runoff, direct precipitation, and extracted ground water

collected in the ponds and the quantity of water evaporated from the ponds. Ground water pumped into the Ponds

ranged from 3.45 million gallons to 33.8 million gallons during this period. Collected runoff and seepage ranged

from 4.9 million gallons to 6.6 million gallons. Direct precipitation collected by the Ponds ranged from 13.6 million

gallons to 17.7 million gallons during the period of 1994 through 1998. The average annual evaporation rates for

the ponds was more constant during this period, ranging from approximately 2.4 to 2.8 gallons per minute per acre.


At no time during this period were there overflows or other discharges of liquids from the lined to the unlined Club

Ranch Evaporation Ponds. The only discharge of liquids from the lined Club Ranch Evaporation Ponds was through

evaporation.

At the end of calendar year 1998, the Club Ranch Evaporation Ponds storage capacity ranged from 43 to 80

percent full, and the remaining freeboard in the Ponds ranged from 5.9 to 9.7 feet.

7.15 Analytical Laboratory Quality Control

A minimum of ten percent duplicates are submitted to the contract laboratory to verify testing procedures. Also,

the Uravan site laboratory runs ten percent duplicates, spikes, blanks, or blinds in-house for an independent check

on consistency. In 1994 and 1995, Umetco considered analytical accuracy and precision to be generally good.

The 1998 Annual Report provided more quantitative data associated with its evaluation of laboratory quality

control. In 1998, approximately 205 sets of water samples were collected at the Uravan site. Eighteen sets of

duplicate samples were collected and analyzed for the same set of parameters as the primary set. Relative percent

difference (RPD) was calculated for results that yielded units of mass, while relative error ratio (RER) was

calculated for results that yielded units of radioactivity. The acceptance criterion for RPD was less than or equal

to 20 percent. The acceptance criterion for RER was less than or equal to 1.0. The eighteen duplicated sample sets

yielded 731 analyte pairs. Seventeen of the 731 pairs, or approximately 2.3 percent, exceeded the respective

acceptance criterion.

8.0 COMMUNITY RELATIONS

After the EPA 1993 Five Year Review was released in 1994, the EPA received a letter from a Mr. Ken Slight of

Moab, Utah. In this letter, Mr. Slight raised a few concerns related to the potential health effects resulting to

individuals using the San Miguel River for recreational purposes, e.g., river outfitters. In early 1995, Dr. Robert

Benson, a toxicologist with the Region VIII Drinking Water Branch, issued a letter to Mr. Gene Taylor, EPA

Remedial Project Manager for the Uravan Superfund Site. In this letter, Dr. Benson concluded there was minimal

hazard to recreational users of the San Miguel River posed by radionuclides in either the water or river sediments.

No other concern letters was received by either the State or the EPA.


9.0 NATIONAL HISTORIC PRESERVATION ACT

9.1 Summary of Section 106 Requirements

The National Historic Preservation Act (NHPA) was enacted because of public concern that so many of our

nation’s historic resources were not receiving adequate attention as the government sponsored much needed public

works projects. In the 1960s, federal preservation law applied only to a handful of nationally significant properties,

and Congress recognized that new legislation was needed to protect the many other historic properties that were

being harmed by federal activities.

Section 106 of NHPA requires that every federal agency “take into account” how each of its undertakings could

affect historic properties. An agency must also afford the Advisory Council a reasonable opportunity to comment

on the agency’s project. Pursuant to the October 1992 Amendments to the National Historic Preservation Act,

an “undertaking” means a project, activity, or program funded in whole or in part under the direct or indirect

jurisdiction of a federal agency, including (A) those carried out by or on behalf of the agency; (B) those carried out

with federal financial assistance; (C) those requiring a federal permit, license, or approval; and (D) those subject

to state or local regulation administered pursuant to a delegation or approval by a federal agency.

For purposes of Section 106, any property listed in or eligible for the National Register of Historic Places is

considered historic. The National Register is this country’s basic inventory of historic resources and is maintained

by the Secretary of the Interior. The list includes buildings, structures, objects, sites, districts, and archaeological

resources. The listed properties are not just of nationwide importance; most are significant primarily at the state or

local level. The protections of Section 106 extend to properties that possess significance but have not yet been

listed or formally determined eligible for listing.

The federal agency involved in the proposed project or activity is responsible for initiating and completing the

Section 106 review process. Under certain circumstances, local governmental bodies may act as the responsible

agency. The agency works with the State Historic Preservation Officer (an official appointed in each state or

territory to administer the national historic preservation program) and the Advisory Council to do so. There can be

other participants in the Section 106 process as well. At times, local governments, representatives of Indian tribes,

applicants for federal grants, licenses, or permits, and others may join in the review process when it affects their

interests or activities.


The Section 106 process includes the following steps:

1. Determine whether an undertaking that could affect historic properties will be initiated. “Historic properties”

are those that are included in the National Register of Historic Places or that meet the criteria for the National

Register. If so, it must identify the appropriate State Historic Preservation Officer Preservation Officer (SHPO)

to consult with during the process. It should also plan to involve the public, and identify other potential

consulting parties. If it determines that it has no undertaking, or that its undertaking has no potential to affect

historic properties, the agency has no further Section 106 obligations.

2. If the agency’s undertaking could affect historic properties, the agency determines the scope of appropriate

identification efforts and then proceeds to identify historic properties in the area of potential effects. The agency

reviews background information, consults with the SHPO and others, seeks information from knowledgeable

parties, and conducts additional studies as necessary. Districts, sites, buildings, structures, and objects listed

in the National Register are considered; unlisted properties are evaluated against the National Park Service’s

published criteria, in consultation with the SHPO. If questions arise about the eligibility of a given property, the

agency may seek a formal determination of eligibility from the National Park Service. Section 106 review gives

equal consideration to properties that have already been included in the National Register as well as those that

meet National Register criteria. If the agency finds that no historic properties are present or affected, it provides

documentation to the SHPO/THPO and, barring any objection in 30 days, proceeds with its undertaking. If

the agency finds that historic properties are present, it proceeds to assess possible adverse effects.

3. The agency, in consultation with the SHPO, makes an assessment of adverse effects on the identified historic

properties based on criteria found in the Council’s regulations. If they agree that there will be no adverse effect,

the agency proceeds with the undertaking and any agreed-upon conditions. If the parties cannot agree or they

find that there is an adverse effect, the agency begins consultation to identify ways to avoid, minimize, or

mitigate adverse effects.

4. In order to resolve adverse effects , the agency consults with the SHPO and others, who may include Indian

tribes and Native Hawaiian organizations, local governments, permit or license applicants, and members of the

public. The Council may participate in consultation when there are substantial impacts to important historic

properties, when a case presents important questions of policy or interpretation, when there is a potential for

procedural problems, or when there are issues of concern to Indian tribes or Native Hawaiian organizations.

Consultation


usually results in a Memorandum of Agreement (MOA), which outlines agreed-upon measures that the agency

will take to avoid, minimize, or mitigate the adverse effects. In some cases, the consulting parties may agree that

no such measures are possible, but that the adverse effects must be accepted in the public interest.

5. If an MOA is executed, the agency proceeds with its undertaking under the terms of the MOA.

6. If consultation proves unproductive, the agency or the SHPO, or the Council itself, may terminate consultation.

If a SHPO terminates consultation, the agency and the Council may conclude an MOA without SHPO

involvement. However, if a THPO terminates consultation and the undertaking is on or affecting historic

properties on tribal lands, the Council must provide its comments. The agency must submit appropriate

documentation to the Council and request the Council’s written comments. The agency head must take into

account the Council’s written comments in deciding how to proceed.

7. Public involvement is a key ingredient in successful Section 106 consultation, and the views of the public should

be solicited and considered throughout the process. The regulations also place major emphasis on consultation

with Indian tribes, in keeping with the 1992 amendments to NHPA. Consultation with an Indian tribe must

respect tribal sovereignty and the government-to-government relationship between the Federal Government

and Indian tribes. Even if an Indian tribe has not been certified by NPS to have a Tribal Historic Preservation

Officer (THPO) who can act for the SHPO on its lands, it must be consulted about undertakings on or affecting

its lands on the same basis and in addition to the SHPO.

9.2 Status of Uravan and the Uravan Superfund Site With the National Historic Preservation Act

The Uravan Historic District, including the Joe Junior Mill and Camp and Uravan were listed on the Colorado State

Register of Historic Places in June 1994. Any undertaking by a State agency must be assessed to determine its

effects on such properties as outlined in Section 80.1 of the State Register Act. In July 1995, the Uravan Historic

District was determined to be eligible for the National Register of Historic Places under Criteria A, as it represented

the history of radium, vanadium, and uranium mining in Colorado, and made a significant contribution to the

Manhatten Project during World War II.


9.3 History of Discussions/Actions Concerning the National Historic Preservation Act at the

Uravan Superfund Site

Neither the Consent Decree or the RAP required Umetco to comply with Section 106 of the National Historic

Preservation Act while implementing remedial actions at the Uravan Superfund Site. In addition, neither the State

or the EPA initiated the Section 106 process, as described in Section 9.1.

The State Historical Society first became aware of remedial activities at Uravan in June 1995 during a site visit to

review work being conducted at Uravan that was funded through the State Historic Fund.

The Colorado Historical Society informed CDPHE in a letter of July 3, 1995 that maintenance of three buildings

at the Uravan Site, e.g., the Boarding House, Recreation Hall, and Uravan Drug Store, would be adequate to

convey this significance of the importance of historic heritage. CDPHE responded in a letter of August 1, 1995 that

compliance with requirements of Section 106 of the Historic Preservation Act of 1966 during the remedial action

at the Uravan Superfund Site were not specifically included in the Final Consent Decree or RAP when they were

issued in 1986. Instead, the RAP only provided for alternatives to demolition if site equipment or facilities pass the

free release criteria for radioactive contaminated materials.

As documented in a September 5, 1995 letter from CDPHE to Umetco, during a June 28, 1995 meeting between

representatives of the CDPHE, State Historical Society, and Umetco, it was agreed that Umetco would not

demolish either the Boarding House or Community Building and that Umetco would attempt to decontaminate the

buildings and install a radon mitigation system in each building. Agreements concerning the status of the Uravan

Store was not documented in this letter.

The Drug Store was demolished in mid- to late-September 1995. In a letter of December 1, 1995 from CDPHE

to the State Historical Society, the agreements made during the June 1996 meeting was amended to state that the

Drug Store would be demolished as the foundation contained excessively high concentrations of radioactive

contamination in its foundation. The letter of September 5, 1995 neglected to require preservation of the Drug Store

until it could be photographed by representatives of the Colorado Historical Society. The Colorado Historical

Society was not notified of the impending demolition of the Drug Store until after demolition was completed.

In a letter of May 22, 1996, the CDPHE informed the EPA of the following alternative remediation measures

concerning the preservation of the Community Center and Boarding House at Uravan


agreed to by the CDPHE, Umetco, the Colorado Historical Society, the Museum of Western Colorado, the

Rimrock Historical Society, and the Town of Naturita:

• Umetco will preserve and spare from demolition the Boarding House, Community Center, and several vehicles

• Umetco would remove the most significant contamination in the structures and in the underlying and immediately

surrounding soils while not endangering the stability of the buildings

• Umetco would then install a radon mitigation system in each building

• Umetco would restore the buildings to the extent that they will be in stable structural condition before the

buildings and surrounding area are transferred to the custody of the Rimrock Historical Society

These alternatives were agreed to in order to both preserve the buildings as an historical resource and to protect

the health of the citizens of Colorado and other visitors.

In 1997, Umetco submitted the results of three engineering studies regarding remediation of the Uravan historical

buildings, including the radon mitigation system plans for the Boarding House and the Community Center. These

reports were approved by the Colorado Historical Society and tentatively approved, with provisions, by the EPA.

In mid-1997, Umetco began developing radon mitigation plans for the historical buildings. Umetco also began

developing excavation plans to remove contaminated material in direct contact with the foundations of the two

buildings.

In early 1998, the State approved the radon mitigation plans and tentatively approved the excavation plans.

Excavation of contaminated materials around the buildings and placement of backfill near the buildings was

completed by mid-1998. In a meeting of June 15, 1998, Umetco reversed their position on preserving the Boarding

House and Community Center and instead recommended that these buildings be demolished. The reported

reasoning behind this change in Umetco’s position was that they were concerned about their long-term legal liability

with leaving the buildings intact, knowing that they could not be completely decontaminated. It was agreed during

this meeting that Umetco would complete a Preliminary Risk Assessment for the buildings by September 1998 using

data obtained from a survey based on the Sampling and Analytical Plan approved by the State. Revisions to the

risk Preliminary Risk Assessment would be made, as necessary, by January 1999 when the buildings

characterization was completed.

Plans to remove and replace the roof was initiated by Umetco in the third quarter of 1998 and were completed the

first quarter of 1999. Estimates were prepared in the second quarter 1999 to replace


and/or refurbish the exterior siding, broken windows, and general exterior maintenance. Estimates and plans were

also being formulated to remove and replace the porch structures on both buildings, as they were in very poor

condition. The estimates and plans were under internal review in the third quarter 1999 and would then be provided

to the Rimrock Historical Society and Colorado Historical Society for review, comment, and concurrence prior

to soliciting bids for the work.

On July 28, 1999, the Colorado Historical Society requested additional information from Umetco regarding a map

of the site indicating specific details of disturbed areas, road construction, current ownership of certain parts of the

site, etc. This information has not yet been provided to the Colorado Historical Society.

9.4 Evaluation of Site’s Compliance With Section 106 Requirements

Based upon a review of the Section 106 documentation discussed above and also of records regarding site

contaminant concentrations and remedial activities, it is concluded that:

1. Initial Uravan site remedial activities were not conducted in compliance with Section 106 requirements,

specifically consultation with the Colorado Historical Society, the Rimrock Historical Society, or the National

Advisory Council on Historic Preservation prior to and during initiation of site activities.

2. Prior to completion of remedial activities, most of the Uravan Superfund Site and associated buildings and

underlying soils contained unacceptable concentrations of radionuclide contamination that precluded their

decontamination to levels protective of human health, and therefore, preservation as historical buildings.

3. Prior to completion of remedial activities, many of the buildings and underlying soils within the Town of Uravan

contained unacceptable concentrations of radionuclide contamination that precluded their decontamination to

levels protective of human health, and therefore, preservation as historical buildings.

4. Other than the Uravan Drug Store, Umetco has preserved the buildings identified by the Colorado Historical

Society and the Rimrock Historic Society as historical buildings in the Uravan Historic District.


5. The Risk Assessment completed by Umetco documented that it is possible, with certain restrictions, to

remediate radionuclide contamination of the Boarding House and Community Center to levels that are

protective of human health.

6. Complete implementation by Umetco on commitments regarding preservation of the two remaining historical

structures is essential to ensure future compliance with Section 106 requirements. This includes the preparation

of an overall site history documentation with photographs that will be submitted. to the Rimrock Historical

Society.

7. Complete understanding of constraints on unrestricted use of the Boarding House and Community Center is

essential to ensure preservation of the health of employees and volunteers working under the auspices of the

Colorado Historical Society and Rimrock Historical Society.

Recommendations:

1. Communication and consultation with the Colorado Historical Society, Rimrock Historical Society, and other

interested parties should be fully undertaken regarding further work at the site that is subject to Section 106

requirements.

2. Umetco should preserve the two remaining historical structures, as presently committed.

3. Volunteers working under the auspices of the Colorado Historical Society and Rimrock Historical Society

should be fully advised of the findings of the risk assessments of the Boarding House and Community Center.

4. Umetco should immediately provide the information requested in the July 28, 1999 letter from the Colorado

Historical Society to Umetco. The Society should also be advised of the status of the funding provided to

Umetco by the Colorado Historic Grant.

9.5 Observations of Site Visit, October 13 and 14, 1999

The two historical buildings were observed during the site visit of October 13 and 14, 1999. The site visit did not

include going into the buildings. Excavation and back filling around both buildings was evident. Although the areas

have not been revegetated by Umetco, small amount of vegetation has been re-established naturally around the

perimeter of the buildings. Both buildings had new roofs, but in general, both buildings visually appeared to be in

need of exterior maintenance, e.g.,


new painting and/or siding, etc. In particular, the porches of the Boarding House were in very poor condition, with

large holes and rotted wood visible from the road.

9.6 Photographs

Photos 9.4-1 through 9.4-4 show the historical buildings as of October 1999. Photo 9.4-1 shows both buildings,

with the Boarding House on the left and the Community Center on the right. Excavation around both buildings is

evident, as are the new roofs. Photo 9.4-2 is a close-up view of the Boarding House. The poor condition of the

upper balcony is evident looking at the bottom side of the balcony. Photo 9.4-3 is a close-up view of the

Community Center. Photo 9.4-4 shows the location of the historical buildings compared to the remediated A-Plant

Area.

10.0 SUMMARY OF SITE VISIT

MK representative, Craig Beck, and EPA representatives, Gene Taylor and Paul Osborne, traveled to the site on

Tuesday, October 12, 1999. MK and EPA representatives arrived at the Umetco site office at 8:30 a.m. on

Wednesday morning, October 13, and met the following personnel:

• John Hamrick: Umetco Manager of Environmental Affairs

• Gene Greenwood: Umetco Site Superintendent

• Mike Schierman: Umetco Radiation Safety Officer

• Rahe Junge: Umetco Site Hydrogeologist

• Don Simpson: Colorado Department of Public Health and Environment, On-Scene Coordinator.

Prior to the meeting, Mr. Schierman conducted a site safety briefing for the MK and EPA representatives, as

required by the Site Health and Safety Plan. Upon completion of this briefing, MK and EPA began the meeting by

discussing the Five Year Review process and what topics would be reviewed during the visit. Mr. Greenwood then

explained the current status of the Uravan Superfund Site and what activities had been initiated and/or completed

since the last EPA Five Year Review was conducted in late-1993. After Mr. Greenwood had completed his

presentation, the group boarded a van to begin a tour of the site.

The tour traveled along County Road EE-22 on its way to the Club Mesa areas. The first area of the site visited

was the Burbank Quarry Repository. As discussed in Section 4.8, the Burbank Quarry Repository has been totally

completed and has received its final cover. A diversion ditch is located along the west and east sides of the

repository. Another diversion ditch separates the lower and


upper repositories. The ditch also delineates the boundary line between the lower repository owned by Umetco

and the upper repository owned by the DOE. While at the Burbank Quarry Repository, the group could also see

parts of the Club Mesa Borrow Area. No operations appeared to be ongoing at the time of the visit.

The Club Mesa Spray Disposal Area could also be viewed from the top of the Burbank Quarry Repository Area.

As discussed in Section 4.5 of this report, remediation of this area is complete and no other actions were ongoing

during the visit.

The tour then traveled to the south side of Tailings Pile #3 and the new B-Plant Repository via a site access road.

This road was barricaded by a locked gate to restrict access by the general public. Warning signs were also

observed on the gate and fences. The group was able to view standpipes of the Toe Drain Collection System of

Tailings Pile #3 and the new toe drain system being installed along the toe of the new B-Plant Repository. The new

B-Plant Repository Return Water Pond was in the final stages of completion, and Umetco was in the process of

abandoning the old Return Water Pond and some of the Tailings Pile #3 toe drain lines that would eventually be

covered by the B-Plant Repository. The south side of the B-Plant Area was also observed during this part of the

tour. Excavation to bedrock was visually confirmed.

The group then traveled back down County Road EE-22 to the Town Dumps Area. Parts of the Hillside Collection

System was viewed. Small quantities of hillside drainage was being collected in the shotcrete-lined ditches that

drained to the Lower Pond located along County Road EE-22. All aspects of this part of the collection system

appeared to comply with the RAP, with the exception of the ditch liner, as discussed in Section 5.1.1 of this report.

On the way to the Town Dumps, the group stopped off by the River Ponds Area. As discussed in Section 4.2 of

this report, remediation of the River Ponds Area is complete. Visually, the site appeared to be in compliance with

the RAP. The remediated A-Plant Area could also be viewed from this vantage point. No remaining buildings were

observed. The group also stopped by the Town of Uravan. No remaining buildings were observed. Vegetation had

been re-established in this area, and the area visually appeared to be in compliance with the RAP.

As discussed in Section 4.7 of this report, the Town Dumps had been excavated in 1998. Excavation of this area

to underlying bedrock was visually confirmed during the visit. Remedial activities at this area appeared to be in

compliance with the RAP. The group then traveled to the Atkinson Creek Disposal Area. As discussed in Section

4.1 of this report, remediation of this area is complete, and


vegetation has re-established itself. This area also visually appeared to be in compliance with the RAP.

The group then traveled back towards the Tailings Pile areas. The group stopped off next to the Club Ranch

Evaporation Ponds. All liners visually appeared to be in good condition. The new enhanced evaporation system

was viewed. All ponds contained liquids and variable amounts of raffinate crystals were observed on the liners.

Prior to entering the Exclusion Zone, a pencil dosimeter was given to Gene Taylor of the EPA to wear during this

part of the tour. While traveleing on the B-Plant Access Road, few remains of the Hillside Structures could be

viewed, primarily adits leading to underground structures located inside Club Mesa. The group then traveled to

Tailings Pile #1-2 to view the ground water seep discovered during the October 1999 CDPHE routine compliance

inspection. Details of the seep are discussed in Section 4.4 of this report. The top of Tailings Pile #1-2 had been

compacted, but was not covered with any part of its final cover. The drainage diversion ditch was constructed along

the north side of the Pile.

The group then traveled to Tailings Pile #3 to view the joint separation. The group also viewed the new piezometers

and surface settlement and movement monuments. Tailings Pile #3 had been covered with all of its final cover

materials except for the riprap, as discussed in Section 4.4 of this report.

While traveling back towards the Site Office Building, the group was able to view the old B-Plant Area on the south

side of Tailings Pile #1-2. None of the B-Plant buildings were observed, and excavation to bedrock in this area

could be confirmed. The existing and new Return Water Ponds could be viewed from this vantage point, also. The

group then stopped to view the remediated A-Plant area. None of the A-Plant buildings or facilities remained.

Excavation had continued to bedrock resulting in excavation of more than eight feet of material in most places.

The tour continued on to the Site Office Building. Prior to leaving the Exclusion Zone, the tour van was

decontaminated with a high-pressure spray wash. Each individual included in the tour was frisked for removable

contamination with a hand-held meter. The pencil dosimeter carried by Gene Taylor was also read at this point and

found to have 0 millirem exposure during the tour.


Upon returning to the office, additional discussions on the site status were conducted. The site visit concluded at

approximately 4:00 p.m, upon which the MK and EPA representatives returned to Naturita.

Craig Beck and Paul Osborne returned to the site at approximately 8:00 a.m. on Thursday morning and met with

Mike Schierman and Gene Greenwood. Mr. Greenwood accompanied the MK and EPA representatives on

another site tour. The first area visited was the Lower Pond located along County Road EE-22. Mr. Greenwood

explained how the pond collected both hillside seepage and runoff water and the means of transferring the water

eventually to the Club Ranch Evaporation Ponds. We then traveled to the Club Mesa Air Monitoring Station where

the air monitors were viewed. The station visually appeared to be in compliance with the RAP. The excessive TSP

concentrations observed in 1998 from the DOE upper Burbank Quarry Repository operations were discussed

while at this station.

The tour then went into the Exclusion Zone to visit the Tailings Piles, Hillside Drainage Collection Systems, and Toe

Drain Systems. Prior to entering the Exclusion Zone, the pencil dosimeter was given to Paul Osborne. The Middle

Pond of the Hillside Drainage Collection System was observed. The pond was located along the B-Plant Access

Road. It collected liquids from a shotcrete-lined ditch. A small quantity of sediment was observed in the bottom

of the pond. Visually, the system appeared to be operated in accordance with the RAP. Toe Drain Sump #2 was

then observed. This was a double chambered concrete structure located at the northeast corner of Tailings Pile

#1-2. Mr. Greenwood explained that this sump was capable of handling the volume of water collected by the Toe

Drain System. The pump had recently been overhauled. This system visually appeared to be operated in compliance

with the RAP. While traveling in the area of the Tailings Piles, the runoff collection system and various ponds were

observed. All aspects visually appeared to be operated in compliance with the RAP.

Upon completion of the Tailings Pile Area visit, the group left the Exclusion Zone. The van was decontaminated

in a similar manner as the previous day. Personnel were screened for removable contamination with a pancake

probe. The pencil dosimeter read 0 millirems.

The group then traveled to some of the other Air Monitoring Stations. All stations visually appeared to be operated

in compliance with the RAP. Following this part of the tour, the group returned to the Site Office Building. Mr.

Mike Schierman showed the auditors the air monitoring laboratory, personal air monitoring equipment, and

calibration equipment. All aspects of the laboratory visually appeared to be in good order. The auditors also

conducted a brief review of site records. All records


requested were provided in a timely manner. The records were found to be well organized. As explained by Mr.

Schierman, some records are maintained at Umetco’s Grand Junction office and are not kept at the site.

After the file audit, the MK and EPA representatives left the site and traveled north along County Road Y-11 to

the general area of the Club Ranch Evaporation Ponds. An area by Pond #1 had visual signs of raffinate crystals

along the San Miguel River. Mr. Osborne of the EPA indicated that this was the same area that he observed

raffinate crystals in 1989. The auditors then returned to Naturita. The auditors returned to Denver on Friday,

October 15, 1999.

11.0 SUMMARY AND RECOMMENDATIONS

Remedial activities at the Umetco Minerals Corporation Uravan Remedial Action Project are being conducted in

general compliance with the RAP. Exceptions noted in this report include:

• Incomplete or missed ground water sampling events in 1994, 1995, 1996 and 1998

• Improper implementation of air sampling procedures

• Non-submittal of Final Completion Reports

Based on available information, it appears that selected remedies remain effective in protecting the health of the

public and environment.

As noted in the report, the following recommendations are made regarding future implementation of RAP

requirements:

1. Final Completion Reports should be submitted to the State for the Atkinson Creek Area, the Mill Areas, Town

and Adjacent Areas, Burbank Quarry, completed Toe Berm Seepage System, Club Ranch Ponds, Club Ranch

Pond Area ground water monitoring and extraction wells completed prior to 1999, should be submitted to the

State as soon as possible.

2. Additional studies should be taken along the banks of the San Miguel River by Club Ranch Evaporation Pond

#1 to determine the presence of raffinate crystals.

3. The joint separation in Tailings Pile #3 should be remediated as soon as possible, and no later than December

31, 2000.


4. Tailings Pile #3 should be investigated for ground water seeps similar to that experienced in Tailing Pile #1-2.

5. The ground water seep identified in Tailings Pile #1-2 should be quickly and thoroughly investigated to

determine potential sources and possible mitigation measures, including construction of additional diversion

structures on Club Mesa.

6. The future remediation strategy for the Hillside Structures should be agreed to by Umetco and the State as soon

as possible to ensure that additional cleanup is undertaken in a manner protective of both the environment and

the workers

7. Documentation of the field approval permitting the use of shotcrete rather than HDPE to line the Hillside

Collection System drainage ditches should be provided as soon as possible.

8. The 1998 Annual Report should be revised to reflect changes in Club Mesa Salt Wash Member of the

Morrison Formation ground water monitoring requirements, e.g., status of wells V-771, V-762 and V-764S,

and radionuclide concentration reporting values.

9. The 1998 Annual Report should be revised to reflect changes in Club Mesa Kayenta-Wingate Sequence

ground water monitoring requirements, e.g., status of wells CRP-16, CRP93-1, CRP93-2, and CRP-93-3,

and radionuclide concentration reporting values.

10. Ground water extraction activities should continue in Club Ranch Pond Area wells completed in high and low

permeability zones until all statistical evaluations required in the RAP are completed.

11. Umetco should undertake air modeling of the site to more scientifically determine the potential exposure of the

nearest resident to contaminants potentially released from the site.

12. Where practicable, additional applications of water should be applied to minimize the quantities of dust released

from the site when high winds are predicted and/or experienced.

13. Statistical analyses of San Miguel River water and aquatic bioassay monitoring results to determine if there are

any discernable trends in surface water quality attributable to the Uravan site.


14. Statistical analyses of San Miguel River aquatic bioassay monitoring results to determine if there are any

discernable effects on San Miguel River aquatic organisms attributable to the Uravan site.

15. Umetco, state, and federal agencies should consult closely and completely with the Colorado Historical Society,

Rimrock Historical Society, and other interested parties to ensure compliance with Section 106 requirements.

16. Umetco should immediately provide requested information to the Colorado Historical Society and completely

implement preservation activities of the two remaining historical structures, as presently committed.

17. Umetco should continue to implement internal QA/QC procedures to ensure collection of all ground water

samples, as scheduled, and that all ground water samples are analyzed for the full suite of analytes.

18. Ground water monitoring results less than the method detection limits for the specific analyte(s) should be

recorded as such, not as “0”.

19. The investigation results of the Atkinson Creek stream bed should be provided to the State as soon as possible.

12.0 REFERENCES

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Five-Year Reviews.

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Guidance.

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Review Guidance.

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Control Division. Re: Response by CDPHE to Recommendations Made in EPA 1993 Five-Year Review.

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of Umetco to Submit an Agreed-Upon Plan for Improving Ground Water Remediation at the Uravan Site.

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of Ground Water Remediation Program, Club Ranch Ponds, Uravan, Colorado - December 31, 1991 to

December 31, 1993. May 23, 1994.

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Response to Ken Sleight’s Letter of December 4, 1994 - Potential Risk of San Miguel Watershed to Recreational

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Historic Preservation. Re: Response to Mr. Klima’s July 7, 1998 Letter Regarding the Uravan Historical Buildings.

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Responding to Don Klima of the Advisory Council on Historic Preservation. Re: Remediation Activities at the

Former Uranium Processing Facility at Uravan, Montrose County, Colorado. April 1999.

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13, 1995.

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CRP-24, CRP-25, CRP-26, TD981, TD982, TD983, TD984, and Extraction Wells WD5, WD6, WD7, and

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Period December 31, 1991 Through December 31, 1993, Club Ranch Ponds, Uravan, Colorado. Prepared for

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Environmental. November 1997

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28,1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-6. Vegetation Sampling. June 30, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-8. Grazing Uptake Monitoring. September

3, 1996.


Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-10. Ground Water Monitoring - Club

Mesa Wells. August 5, 1996.

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Locations, Valley Wells, Addendum A. August 19, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-12. Fugitive Dust Control Plan. September

3, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-14. Nearest Resident Radiation Dose

Determination. May 29, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-16. Aquatic Bioassay Monitoring. August

16,1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-18. Soil Sampling. June 30,1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-20. San Miguel River Water Quality

Monitoring. July 7, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-21. Hillside Seepage Monitoring. August

24, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-23. Runoff Control Monitoring. September

3, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-28. Waste Handling Plan.

September 10, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. E-32. Tailings Stability Monitoring.

September 24, 1996.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. R-6. Radiological Survey for Release of

Personnel and Equipment. May 6. 1996.


Umetco Minerals Corporation. 1997. Policy and Procedures Manual. R-6. Radiological Survey for Release of

Personnel and Equipment. October 23, 1997.

Umetco Minerals Corporation. 1996. Policy and Procedures Manual. R-9. Alpha and Beta/Gamma Surveys. May

6, 1996.

Umetco Minerals Corporation. 1998. Site Health and Safety Plan. December 1, 1998.

Umetco Minerals Corporation. 1997. Geotechnical Engineering Evaluation - Joint Separation, Tailings Pile No.3,

Uravan Remedial Action Project, Uravan, Colorado. December 7, 1997.

Umetco Minerals Corporation. 1998. Letter from Curtis Sealy to Don Simpson of CDPHE. Re: Field Change

Order - Field Changes, Burbank Repository. January 9, 1998.

Umetco Minerals Corporation. 1998. Letter from Curtis Sealy to Don Simpson of CDPHE. Re: Field Change

Order - Final Configuration of Burbank Crystal Repository. September 24, 1998.

Umetco Minerals Corporation. 1999. Letter from Curtis Sealy to Don Simpson of CDPHE. Re: Uravan Remedial

Action Plan - Lower Burbank Repository. January 4, 1999.

Umetco Minerals Corporation. 1999. Letter from Curtis Sealy to Don Simpson of CDPHE. Re: Uravan Remedial

Action Plan - Lower Burbank Repository. January 8, 1999.

Umetco Minerals Corporation. 1997. Final Plans and Specifications for Remedial Activities for New B-Plant

Repository. November 1997.

Umetco Minerals Corporation. 1997. Final Plans and Specifications for Remedial Activities for The Town Dump.

1997.

Umetco Minerals Corporation. 1998. Final Plans and Specifications for Remedial Activities for Club Mesa Final

Reclamation. February 1998.

Umetco Minerals Corporation. 1997. Design Change Order - Construction of Surface Runoff Control Facilities

Associated With the Club Mesa Area. July 19, 1997.


Umetco Minerals Corporation. 1998. Club Mesa Final Reclamation. Rock Mulch Grading Fill Material

Specification. January 27, 1998.

Umetco Minerals Corporation. 1998. Compliance Report. Completed Construction Segment. Cleanup of Raffinate

Crystals, Neutralized Sludge, and Contaminated Soils, Including Dewatering the Storage Ponds, Club Mesa Area.

February 27, 1998.

Umetco Minerals Corporation. 1997. Compliance Report. Completed Construction Segment. Backfilling of

Subsided Areas and Closure of Mine Shafts and Portals, Club Mesa Area. February 27, 1997.

Umetco Minerals Corporation. 1999. Letter from Curtis Sealy to Karen Hardy of the Colorado Historical Society.

Re: Historical Compilation, Uravan, Colorado. June 21, 1999.

Miscellaneous References

National Historic Preservation Act of 1966, Part 106.

Ken Sleight. 1994. Letter from Ken Sleight to Robert Duprey of the EPA. Re: Potential Health Effects of the San

Miguel River to Recreational Users. December 4, 1994.

Advisory Council on Historic Preservation. 1999. Letter From Don Klima to William Yellowtail of the EPA. Re:

Remediation Activities at the Former Uranium Processing Facility at Uravan, Montrose County, Colorado. April

15, 1999.

Colorado Historical Society. 1999. Letter from Georgiana Contiguglia to Curtis Sealy of Umetco. Re: Additional

Information Regarding the Uravan Site. July28,1999.

APPENDIX 1

FIGURES

APPENDIX 2

PHOTOGRAPHS

APPENDIX 3

SUMMARY OF GROUND WATER MONITORING RESULTSCLUB MESA SALT WASH MEMBER OF THE MONITORING FORMATION

MONITORING WELLS 1994-1998

F:\Beck\Rac\Uravan Water Quality.wpd Page 1 of 7

Appendix 3Summary of Ground Water Monitoring Results

Club Mesa Salt Wash Member of the Morrison Formation Monitoring Wells 1994-1998(Excerpted from Revised 1996 and 1998 Annual Environmental Monitoring Reports, Umetco Minerals Corp., Uravan, CO

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Am

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Ars

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(mg/

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Bic

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(mg/

L)

Cal

cium

(mg/

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Car

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te(m

g/L

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Chl

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g/L

)

Iron

(mg/

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Mag

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Man

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Mol

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Pot

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Sele

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(mg/

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Sodi

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Sulfa

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TD

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Van

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Gro

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Pol

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m(p

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Rad

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(pC

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Rad

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(pC

i/L)

Tho

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(pC

i/L)

Nat

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Ura

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(pC

i/L)

CRP -15

10/28/98 <0.1 0.04 0.006 182 181 <10 445 0.7 31.2 <0.05 <0.01 <0.2 15 <0.005 124 34 1080 <0.05 <0.025 -5.4 0.3 0.2 0.4 1.4 -0.09 <0.6093

8/96 <0.1 0.1 NA 190 179 <1 449 0.70 31.2 <0.05 NA1 <0.2 14.0 <0.005 125 36 1290 NA <0.025 NA NA NA 0.7 NA -0.1 1.3

8/95 <0.1 0.2 <0.003 200 182 <1 442 0.50 31.7 <0.05 NA <0.2 13.0 <0.005 127 37 1530 <0.05 <0.025 4 NA NA 0.5 NA -0.1 1.3

2/95 <0.1 2.6 <0.003 182 190 <1 459 0.60 30.4 <0.05 NA <0.2 12.0 <0.005 114 40 1070 <0.05 <0.02 2 NA NA 1.3 NA -0.2 1.4

12/94 <0.1 <0.1 <0.003 2313 190 <1 455 0.60 30.9 <0.05 NA <0.2 13.0 <0.005 125 40 1052 <0.05 <0.025 0 NA NA 0.5 NA 0.1 1.5



Wel

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Alu

min

um(m

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Am

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ia(m

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Ars

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(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

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ndum

(mg/

L)

Nitr

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+ N

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e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

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Sulfa

te(m

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TD

S(m

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Van

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m(m

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Zin

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Gro

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Pol

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m(p

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Rad

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(pC

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Rad

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(pC

i/L)

Tho

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(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CM93-1

11/06/98 <0.1 0.12 0.007 490 147 <5 1410 4.5 23.6 <0.05 <0.01 <0.01 20 <0.005 1210 642 3780 <0.05 8.39 24 0.3 0.3 1 1.6 -0.1 2.8434

9/24/98 <0.1 0.07 NA 484 154 <5 1490 NA 23.1 NA NA <0.01 17 NA 1100 681 3660 NA NA NA NA NA NA NA NA 0.9478

6/16/98 <0.1 0.25 0.008 518 146 <5 1390 4.5 22.8 <0.05 <0.01 <0.01 17 <0.005 970 635 3750 <0.05 9.92 14 0.2 0.1 0.8 1.4 0.06 1.7602

3/4/98 <0.1 0.2 0.006 491 155 <5 1350 1.4 24.3 <0.05 <0.02 <0.01 17 <0.005 1100 640 3730 <0.05 10.40 -11 -0.3 0.6 0.6 1.8 0 2.5049

12/97, 9/97,6/97

NR2 NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR

2/97 <0.1 0.2 NA 509 155 <5 1400 <0.1 24.3 <0.05 NA <0.015 20.0 <0.002 1230 599 3750 NA 5.1 NA NA NA 0.8 3.6 -0.1 0.10

12/96 <0.1 0.2 NA 487 166 <1 1470 <0.1 24.9 <0.05 NA <0.015 21.0 0.005 1240 667 3720 NA 5.6 NA NA NA 0.6 2.0 -0.2 1.08

9/96 NA NA NA NA NA NA NA <0.1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA

6/96 <0.1 0.3 NA 511 155 <1 1430 NA 24.0 <0.05 NA <0.15 18.0 <0.005 1160 638 3510 NA 5.3 NA NA NA 1.0 1.5 0.0 1.02

2/96 <0.1 0.2 NA 532 143 <1 1500 <0.1 22.8 <0.05 NA <15 18.0 <0.005 1130 610 3670 NA 5.4 NA NA NA 1.2 2.0 0.1 3.72

12/95 <0.1 1.0 NA 496 150 <1 1410 <0.1 23.0 <0.05 NA <15 19.0 <0.005 1220 620 3560 1180 5.5 NA NA NA 0.5 2.3 0.3 <0.2

8/95 <0.2 1.0 0.007 524 155 <1 1430 <0.1 27.6 <0.1 <0.02 <0.4 20.0 <0.005 1210 627 3570 <0.1 6.4 24 NA NA 0.6 NA -0.1 3.25

5/95 <0.2 0.3 NA 504 155 <5 1450 <0.2 24.2 <0.1 NA <0.55 19.0 <0.03 1220 611 3580 NA 5.8 NA NA NA 0.4 1.7 0.3 1.69

2/95 <0.2 <0.5 0.008 498 154 <1 1560 <0.2 22.7 <0.1 NA <0.2 18.0 <0.005 1130 630 3650 <0.1 5.2 -10 NA NA 0.7 NA -0.1 0.95

12/94 <0.2 0.1 0.010 510 154 <1 1450 <0.2 23.6 <0.1 NA <0.4 19.0 0.003 1153 636 3580 <0.1 5.3 -13 NA NA 0.9 NA 0.3 1.35

9/94 <0.1 0.3 <0.100 496 135 <1 1430 <0.2 24.4 <0.05 NA <0.4 19.4 0.003 1220 617 3470 <0.05 5.3 13 NA NA 0.6 NA 0.4 0.47

5/94 <0.05 0.2 0.007 504 151 <1 1520 <0.02 22.1 0.03 <0.01 <0.2 19.3 <0.001 1100 650 3400 <0.01 7.3 7 NA NA 0.9 0.7 0.0 0.80

2/94 <0.05 0.3 0.010 504 153 <0.1 1430 <0.02 24.3 0.03 <0.01 <0.2 21.0 <0.002 1200 619 3570 <0.01 5.8 9 NA NA 0.7 2.3 0.0 1.40



Wel

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dSa

mpl

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Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

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(mg/

L)

Bic

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nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

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e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

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ndum

(mg/

L)

Nitr

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+ N

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g/L

)

Pot

assi

um(m

g/L

)

Sele

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(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

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m(m

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)

Zin

c(m

g/L

)

Gro

ssA

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Lea

d-21

0(p

Ci/L

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Pol

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m(p

Ci/L

)

Rad

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-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

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(pC

i/L)

Nat

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Ura

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(pC

i/L)


CM93-2

11/12/98 <0.1 0.13 0.011 438 382 <5 2730 19.14 37.7 0.09 <0.01 <0.1 21 <0.005 1390 1020 5070 <0.05 7.25 43 0.2 0.3 0.6 2.4 -0.1 <0.6093

9/23/98 <0.1 0.01 NA 437 390 <5 2140 NA 36.9 NA NA <0.1 20 NA 1250 736 4880 NA NA NA NA NA NA NA NA <0.6093

6/16/98 <0.1 0.17 0.008 424 381 <5 2040 12 37.2 0.08 <0.01 <0.1 20 <0.005 1270 725 4900 <0.05 7.92 5 -0.5 0 0.8 1.2 -0.09 2.3695

3/4/98 <0.1 0.2 0.008 438 387 <5 2020 6.8 37.2 0.07 <0.02 <0.1 18 <0.05 1240 742 4890 <0.05 7.96 10 0.1 0.9NR 0.5 1.4 0 3.6558

12/97,9/97,6/97

NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NA NR NR NR NR

2/97 <0.1 0.2 NA 464 381 <5 2290 1.20 37.3 <0.05 NA <0.15 20.0 <0.010 1360 736 4870 NA 8.2 NA NA NA 0.6 2.3 0.0 0.0

12/96 <0.1 0.2 NA 460 408 <1 2090 1.30 38.7 <0.05 NA <0.15 24.0 <0.025 1420 715 4920 NA 10.1 NA NA NA 1.2 2.5 -0.2 1.5

9/96 <0.1 0.3 NA 460 380 <1 2040 1.10 39.2 0.05 NA <0.15 20.0 <0.025 1340 697 4730 NA 9.3 NA NA NA 0.3 2.0 NA NA

6/96 <0.1 0.3 NA 465 387 <1 2070 0.60 37.6 <0.05 NA <0.15 22.0 <0.005 1400 755 4750 NA 10.4 NA NA NA 0.9 2.4 NA NA

2/96 <0.1 0.3 NA 476 361 <5 2100 0.90 35.9 <0.05 NA <0.15 18.0 <0.005 1280 700 4770 NA 9.8 NA NA NA 1.1 3.1 0.2 4.6

12/95 <0.1 0.3 NA 470 385 <1 2070 0.60 38.1 <0.05 NA <0.55 NA <0.005 1380 720 4930 NA 10.2 NA NA NA 0.9 2.5 0.1 <0.2

8/95 <0.2 0.3 0.006 480 370 <5 2140 0.40 37.1 <0.1 <0.02 <1.0 21.0 0.005 1370 695 4700 <0.1 11.6 -3 NA NA 1.0 NA 0.1 0.3

5/95 <0.2 0.3 NA 468 390 <5 2050 <0.2 38.2 <0.1 NA <0.25 21.0 <0.001 1410 694 4920 NA 13.5 NA NA NA 0.6 2.0 0.2 <0.2

2/95 <0.2 <0.5 0.009 460 284 <1 2270 1.30 36.9 <0.05 NA <0.1 21.0 <0.005 1330 724 4940 <0.1 13.7 16 NA NA 0.7 NA 0.0 1.0

12/94 <0.2 0.1 <0.001 466 370 <1 2150 <0.2 36.4 <0.1 NA <0.4 19.0 <0.005 1313 714 4620 <0.1 12.3 25 NA NA 1.3 NA 0.2 0.2

9/94 <0.2 0.3 <0.001 468 349 <1 2120 <0.02 37.5 <0.1 NA 0.4 20.0 <0.02 1360 718 4880 <0.1 11.9 19 NA NA 0.8 NA -0.4 <0.203

5/94 <0.05 <0.2 0.004 442 392 <1 2080 0.07 33.8 0.02 <0.01 <0.2 19.7 <0.001 1260 725 4670 <0.01 11.3 11 NA NA 0.7 0.9 0.0 0.9

2/94 <0.05 0.3 <0.001 468 376 <0.1 2010 0.06 37.7 0.03 <0.01 <0.2 21.0 <0.002 1340 701 4530 <0.01 16.3 9 NA 1.0 2.5 0.0 1.4



Wel

l #an

dSa

mpl

eD

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Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

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(mg/

L)

Bic

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nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

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+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

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Pol

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m(p

Ci/L

)

Rad

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(pC

i/L)

Rad

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(pC

i/L)

Tho

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(pC

i/L)

Nat

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Ura

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(pC

i/L)


CM93-3

11/11/98 <0.1 0.15 0.007 214 211 <5 693 1.7 61.1 <0.05 <0.01 <0.1 23 <0.005 199 89 1460 <0.05 3.45 -0.7 0.6 0.5 0.5 1.1 -0.08 <0.6093

9/24/98 <0.1 0.03 NA 203 223 <5 738 NA 61 NA NA <0.1 22 NA 207 98 1520 NA NA NA NA NA NA NA NA <0.6093

6/9/98 <0.1 0.19 <0.003 210 226 <5 457 0.4 60.4 0.06 <0.01 <0.0009

<0.1 19 <0.005 198 95 1550 <0.05 4 0 0.1 0.5 1.5 0.06 <0.6093

3/5/98 <0.1 0.2 0.005 200 221 <5 1020 2.6 61.7 0.06 <0.01 <0.5 22 <0.05 188 92 1540 <0.05 1.29 2.1 00.2 0.4 0.3 1.6 00.1 4.4005

12/97,9/97,6/97

NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR

3/97 <0.1 0.10 NA 224 244 <5 745 0.70 60 0.06 NA <0.15 23.0 <0.002 231 80 1470 NA 4.1 NA NA NA -0.2 2.7 -0.2 0.00

12/96 <0.1 0.20 NA 209 244 <1 700 0.60 60 0.06 NA 0.15 21.0 <0.005 225 92 1420 NA 4.4 NA NA NA 0.8 1.6 0.0 0.81

9/96 <0.1 0.20 NA 203 230 <5 703 0.20 59 0.07 NA <0.45 22.0 0.001 213 82 1610 NA 4.5 NA NA NA 0.2 1.6 0.0 0.00

6/96 <0.1 0.30 <0.1 209 245 <1 710 <0.1 58 0.06 NA <0.15 23.0 <0.005 225 83 1630 NA 4.6 NA NA NA 0.4 3.8 -0.2 0.00

3/96 <0.1 0.30 NA 225 233 <1 680 <0.1 56 0.06 NA <0.15 22.0 <0.005 211 80 1450 NA 4.3 NA NA NA 1.4 2.9 0.0 1.02

12/95 <0.1 0.20 NA 220 235 <5 690 <0.1 57 0.07 NA <0.15 22.0 <0.005 220 81 1660 NA 4.7 NA NA NA 0.7 2.1 0.0 1.42

8/95 <0.1 0.70 0.005 200 236 <1 710 <0.1 55 0.07 NA <0.2 21.0 <0.005 217 84 2030 <0.05 4.7 16 NA NA 0.5 NA 0.0 1.29

5/95 <0.1 0.70 NA 204 224 <5 728 <0.1 65 0.11 NA <0.25 23.0 <0.005 225 97 1440 NA 5.8 NA NA NA 0.2 2.1 -0.2 2.03

3/95 <0.1 0.20 0.006 212 247 <1 748 <0.1 53 0.05 NA <0.2 21.0 <0.005 239 73 1660 <0.05 4.7 -2 NA NA 0.7 NA -0.2 0.74

12/94 <0.1 0.20 0.006 200 263 <1 809 <0.1 52 0.05 NA 0.3 18.7 <0.005 231 69 1640 <0.05 4.7 10 NA NA 1.1 NA 0.5 <0.203

9/94 <0.1 0.20 0.006 177 229 <1 718 <0.1 49 0.05 NA 0.2 19.2 0.002 242 58 1760 <0.05 4.6 10 NA NA 1.0 NA 0.4 <0.203

5/94 <0.1 1.60 0.006 200 273 <1 825 <0.02 48 0.06 <0.01 <0.2 19.5 <0.001 234 70 1860 <0.01 4.7 0 NA NA 0.5 2.6 0.0 0.70

2/94 <0.05 0.20 0.006 206 266 <0.1 784 <0.02 51 0.07 <0.01 <0.2 20.0 <0.002 241 66 1730 <0.01 5.3 0 NA NA 0.4 3.1 0.0 0.70

V766A

10/29/98 <0.1 0.7 0.01 318 291 <10 306 <0.1 261 0.79 0.09 20 40 0.074 310 1520 3090 0.44 <0.025 651 0.9 1.1 0.09 1.8 0.2 677



Wel

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dSa

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Alu

min

um(m

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Am

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)

Ars

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(mg/

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Bic

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nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

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)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


7/96 <0.1 24 NA 544 484 <1 721 <0.01 667 1.7 NA 52 73 0.10 755 3920 7180 NA <0.025 NA NA NA 0.1 0.2 1.7 2031

8/95 <0.1 17 0.006 562 514 <5 650 <0.1 764 1.78 0.05 54 76 0.22 662 4090 7650 0.64 <0.025 2360 NA NA 0.2 NA 0.7 1713

2/95 <0.1 25 0.005 453 530 <1 861 <0.1 659 1.84 NA 56 68 0.11 780 4380 7500 0.82 <0.02 1510 NA NA 0.1 NA 0.1 1164

12/94 <0.1 26 0.008 471 533 <1 826 <0.1 677 1.91 NA 55 74 0.07 824 4060 7480 0.94 <0.025 964 NA NA 0.2 NA 0.0 1232



Wel

l #an

dSa

mpl

eD

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Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

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Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


V768

11/16/98 <0.1 0.07 <0.003 278 87.7 <5 296 <0.1 45.2 <0.05 <0.01 1 16 0.005 158 51 824 <0.05 <0.025 13 0 0.4 0.1 -0.2 -0.05 16.925

9/22/98 <0.1 0.08 NA 252 114 <5 468 NA 43 NA NA 0.9 17 NA 211 73 1120 NA NA NA NA NA NA NA NA 14.894

6/16/98 <0.1 0.42 0.003 271 104 <5 383 <0.1 46.1 <0.05 <0.01 0.8 18 0.009 199 61 1040 <0.05 0.059 15 -0.2 0.2 0.4 0.7 0.03 13.54

3/9/98 <0.1 <0.01 <0.003 374 112 <5 13 <0.1 50.4 <0.05 <0.01 0.9 16 0.008 180 34 344 <0.05 0.033 8.4 0.1 0.6 0.6 0 -0.3 14.894

12/97,9/97,6/97


3/97 <0.1 <0.01 NA 274 136 <5 546 <0.1 53 <0.05 NA 0.75 19.0 0.011 266 84 1180 NA <0.025 NA NA NA 0.3 0.9 -0.1 16.9

12/96 <0.1 0.04 NA 279 146 <1 595 <0.1 54 <0.05 NA 0.55 19.0 0.008 291 87 1310 NA <0.025 NA NA NA 0.6 0.8 0.0 13.5

9/96 <0.1 0.08 NA 281 132 <1 519 <0.1 47 <0.05 NA 0.85 19.0 0.010 255 80 1200 NA 0.025 NA NA NA 0.5 0.5 0.0 14.2

6/96 <0.1 0.07 NA 306 120 <5 428 <0.1 51 <0.05 NA 0.95 18.0 0.006 225 68 1110 NA 0.054 NA NA NA 0.4 1.2 0.0 12.9

3/96 <0.1 <0.1 NA 309 56 <5 140 <0.1 45 <0.05 NA <0.15 16.0 0.009 94 40 488 NA 0.034 NA NA NA 0.3 1.4 0.2 14.2

12/95 <0.1 <0.1 NA 280 133 <1 500 <0.1 49 <0.05 NA 0.85 18.0 0.007 258 80 1210 NA <0.025 NA NA NA 0.5 1.5 0.1 15.6

8/95 <0.1 0.10 <0.003 322 164 <1 640 <0.01 57 <0.05 <0.01 0.7 21.0 0.006 330 99 1770 <0.05 <0.02 20 NA NA 0.7 NA NA 13.9

5/95 <0.1 0.10 NA 304 146 <5 558 <0.1 58 <0.05 NA 0.75 19.0 0.010 289 85 1290 NA 0.040 NA NA NA 0.4 2.3 0.0 16.1

3/95 <0.1 <0.1 <0.003 297 134 <1 582 <0.1 52 <0.05 NA <0.1 19.0 0.012 282 87 1310 <0.05 <0.02 16 NA NA 0.4 NA -0.1 13.9

12/94 <0.1 0.10 <0.001 298 142 <1 603 <0.1 63 <0.05 NA 0.6 19.9 0.004 287 90 1340 <0.05 0.040 20 NA NA 1.0 NA 0.5 15.8

9/94 <0.1 <0.1 <0.001 290 114 <1 516 <0.1 57 <0.05 NA 0.5 19.4 0.004 255 83 1180 <0.05 <0.025 16 NA NA 0.4 NA 0.5 13.5

5/94 <0.05 <0.2 <0.001 278 116 <1 450 <0.02 49 0.01 <0.01 0.8 17.7 0.006 206 70 1060 <0.01 0.022 20 NA NA 0.6 0.1 0.0 15.0

2/94 <0.05 <0.2 <0.001 292 114 <0.1 421 <0.02 52 0.01 <0.01 0.6 18.6 0.006 214 67 990 <0.01 0.022 15 NA NA 0.5 1.3 0.0 14.0



Wel

l #an

dSa

mpl

eD

ate

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


V769

11/11/98 <0.1 0.28 <0.003 354 40 <5 13 <0.1 53.2 <0.05 <0.01 1 21 0.023 38 35 400 <0.05 0.233 10 0.7 0.6 1.1 1.7 -0.09 16.925

9/24/98 <0.1 <0.01 NA 356 41.3 <5 13 NA 51.2 NA NA 1.3 19 NA 39 35 644 NA NA NA NA NA NA NA NA 18.956

6/9/98 <0.1 0.12 <0.003 374 41.9 <5 13 <0.1 49.7 <0.05 <0.01 1.1 18 0.02 36 36 370 <0.05 0.284 15 0.2 0.7 1.6 0.9 -0.007

18.279

3/9/98 <0.1 0.04 <0.003 302 41.8 <5 388 <0.1 51.6 <0.05 <0.01 1.1 20 0.022 38 67 974 <0.05 0.375 23 0.3 0.7 1.7 2.3 -0.1 16.248

12/97,9/97,6/97


3/97 <0.1 0.40 0.000 344 41 <1 13 <0.1 52 <0.05 0.00 0.85 20.0 0.024 41.0 33 396 0.00 0.172 0 NA NA 1.1 NA -0.1 20

12/96 <0.1 <0.02 0.000 342 41 <1 13 <0.1 54 <0.05 0.00 1.15 20.0 0.022 42.0 33 358 0.00 0.168 0 NA NA 1.4 NA -0.1 20

9/96 <0.1 <0.10 0.000 366 45 <1 16 <0.1 54 <0.05 0.00 1.15 20.0 0.022 41.0 35 358 0.00 0.300 0 NA NA 1.1 NA 0.0 21

6/96 <0.1 0.05 0.000 351 43 <1 13 <0.1 51 <0.05 0.00 1.15 21.0 0.022 42.0 34 382 0.00 0.205 0 NA NA 1.3 NA 0.0 20

3/96 <0.1 <0.1 0.000 179 41 <1 12 <0.1 49 <0.05 0.00 <0.15 20.0 0.022 38.0 33 330 0.00 0.283 0 NA NA 1.2 NA 0.1 23

12/95 <0.1 <0.1 0.000 362 40 <5 12 <0.1 51 <0.05 0.00 1.25 0.0 0.017 39.0 33 374 0.00 0.209 0 NA NA 1.2 NA 0.0 18

8/95 <0.1 0.10 <0.003 362 41 <1 12 <0.1 50 <0.05 <0.01 0.95 20.0 0.013 39.0 33 380 <0.05 0.284 15 NA NA 0.9 NA 0.1 22

3/95 <0.1 0.20 <0.003 393 41 <1 13 <0.1 50 <0.05 NA 0.8 20.0 0.024 42.0 32 370 <0.05 0.270 19 NA NA 1.2 NA -0.1 17

12/94 <0.1 0.10 <0.001 350 40 <1 16 <0.1 48 <0.05 NA 1.1 18.6 0.027 40.0 36 370 <0.05 0.231 19 NA NA 1.0 NA 1.3 17

9/94 <0.1 0.10 <0.001 364 36 <1 16 <0.1 53 <0.05 NA 1.1 20.2 0.021 42.0 34 340 <0.05 0.221 22 NA NA 1.1 NA 0.6 17

5/94 <0.05 0.80 <0.001 354 39 <1 16 <0.02 50 <0.01 <0.01 1.2 20.1 0.022 40.3 35 350 <0.01 0.332 18 NA NA 1.7 1.4 0.0 16

2/94 <0.05 <0.2 <0.001 354 39 <0.1 15 <0.02 52 <0.01 <0.01 1.1 20.3 0.021 41.1 33 340 <0.01 0.252 16 NA NA 1.5 1.7 0.0 15

1. NA: Not Analyzed2. NR: Analytical Results for These Dates or Quarters of the Year Not Included in Cited Documents3. 777: Highest Value of Analyte Reported in Cited Documents4. 111: Lowest Value of Analyte Reported in Cited Documents5. Reported Analytical Result for Nitrate Only Rather Than for Nitrate + Nitrite

APPENDIX 4

SUMMARY OF GROUND WATER MONITORING RESULTSCLUB MESA KAYENTA - WINGATE MONITORING WELLS

1994-1998

F:\Beck\Rac\Uravan Water Quality-3.wpd Page 1 of 2


Club Mesa Kayenta - Wingate Monitoring Wells 1994-1998(Excerpted from Revised 1996 and 1998 Annual Environmental Monitoring Reports, Umetco Minerals Corp., Uravan, CO

Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)

V763S

7/21/98 <0.1 95 <0.003 830 503 <5 1630 <0.1 3410 2.34 <0.01 367 238 1.54 1370 11700 24400 0.18 <0.025 1560 0.7 0.4 0.6 1.7 0.9 1760.2

1997 NR2 NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR

7/96 <0.3 78 NA 820 490 <5 1060 <0.3 2450 2.90 NA 2244 176 0.81 996 10200 17600 NA 0.10 NA NA NA 0.9 0.1 2.0 1489

8/95 <0.5 77 <0.003 844 437 <5 1200 <0.5 2530 2.46 <0.05 251 214 1.17 1170 11100 19800 <0.25 <0.125 1640 NA NA 0.5 NA 1.9 1090

3/95 <1 83 NA1 872 NA <1 1510 <1 3451 3.30 NA 3184 212 1.40 1360 14100 23300 NA <0.2 NA NA NA 1.0 1.0 3.9 1808

1994 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA

V770

7/27/98 6.4 2030 <0.003 635 479 <5 1420 457 5600 112 <0.01 17.3 346 0.58 1560 34300 41800 <0.05 58.2 1910 -0.3 1 84.93 3 0.8 744.7

1997 NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR

8/96 6.6 1990 NA 750 481 <1 1620 450 5780 114 NA 34.04 344 0.600 1700 31600 44400 NA 60 NA NA NA 4.0 3.3 0.8 1150

10/95 6.0 2140 <0.006 708 413 <5 1660 372 4975 98 <0.1 35.6 375 0.707 1680 32800 43800 <0.50 51 2210 NA NA 2.5 NA 1.0 914

3/95 7.0 2180 NA 748 NA <1 1670 400 5550 109 NA 34.34 357 0.88 1690 32900 43400 NA 55 NA NA NA 0.6 14.0 1.6 1022



Club Mesa Kayenta - Wingate Monitoring Wells 1994-1998(Excerpted from Revised 1996 and 1998 Annual Environmental Monitoring Reports, Umetco Minerals Corp., Uravan, CO

Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


V771



7/96 <0.1 52 NA 104 509 <5 581 <0.1 938 6.0 NA 2044 61 1.81 686 4890 8410 NA 1.21 NA NA NA 0.6 0.8 0.4 677

10/95 <0.1 180 NA 100 477 <5 680 <0.2 1620 13.5 NA 2414 102 1.68 839 8000 13200 NA 2.38 NA NA NA 3.7 0.2 0.7 238


V772

7/23/98 <0.1 567 <0.003 842 408 <5 2040 <0.1 4780 9.66 <0.01 204 219 18.7 1760 22200 34100 0.42 0.5 1790 0.6 0.8 5.3 1.3 1.2 2437.2


7/96 <0.5 550.0 NA 900 380 <5 1800 <0.5 4910 7.21 NA 2104 212 NA 1710 21100 32600 NA <0.1 NA NA NA 5.4 0.9 15.0 2234

9/95 <0.5 506.0 <0.005 840 340 <5 1710 <0.5 4020 5.75 <0.05 185 203 NA 1580 19000 29100 0.34 <0.125 2230 NA NA 4.5 0.0 2.0 2444


1. NA: Not Analyzed2. NR: Analytical Results for These Dates or Quarters of the Year Not Included in Cited Documents3. 777: Highest Value of Analyte Reported in Cited Documents4. Reported Analytical Result for Nitrate Only Rather Than for Nitrate + Nitrite

APPENDIX 5

SUMMARY OF GROUND WATER MONITORING RESULTSSAN MIGUEL RIVER VALLEY KAYENTA - WINGATE SEQUENCE

MONITORING WELLS1994-1998



San Miguel River Valley Kayenta - Wingate Sequence Monitoring Wells 1994-1998(Excerpted from Revised 1996 and 1998 Annual Environmental Monitoring Reports, Umetco Minerals Corp., Uravan, CO)

Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)

CRP-1

10/19/98 <0.1 0.03 NA1 214 58.5 <5 8 NA 29.3 NA NA 0.2 15 NA 22 102 362 NA NA NA NA NA NA NA NA <0.6093

8/12/98 <0.1 <0.1 NA 218 55.8 <5 8 NA 29.6 NA NA <0.1 15 NA 24 117 380 NA NA NA NA NA NA NA NA 1.2186

4/23/98 <0.1 0.07 0.004 204 58 <5 9 <0.1 31.7 <0.05 <0.01 <0.1 14 <0.005 21 116 328 <0.05 <0.025 392 0.3 0.6 0.37 0.2 0.135 <0.6093

2/4/98 <0.1 0.02 <0.003 212 62.2 <5 9 <0.1 34.3 <0.05 <0.01 <0.1 18 <0.005 25 123 410 <0.05 <0.025 7.6 0.1 0.3 0.5 -0.7 -0.1 0.7447

1/97 <0.1 0.04 0.004 198 64 <5 9 <0.1 36 <0.05 NA <0.144 16 <0.005 23 126 400 <0.05 <0.025 4.4 NA NA 0.7 NA -0.2 NA

10/96 <0.1 0.06 0.003 213 66 <5 10 <0.1 36 <0.05 NA <0.144 17 <0.005 25 132 370 <0.05 <0.025 3.1 NA NA 0.2 NA -0.1 NA

9/96 <0.1 0.2 <0.003 222 65 <5 10 <0.1 34 <0.05 NA <0.144 17 <0.005 24 135 394 <0.05 <0.025 6.4 NA NA 0.5 NA -0.1 NA

5/96 <0.1 0.1 0.004 214 66 <5 10 <0.1 35 <0.05 NA <0.144 16 <0.005 24 140 406 <0.05 <0.025 4.2 NA NA 0.6 NA 0 NA

3/96 <0.1 <0.1 <0.003 220 67 <5 10 <0.1 37 <0.05 NA <0.144 16 <0.005 25 139 352 <0.05 <0.025 1.9 NA NA 0.6 NA <0.1 4.0

12/95 <0.1 <0.1 <0.003 210 70 <1 11 <0.1 37 <0.05 NA <0.144 16 <0.005 25 147 394 <0.05 <0.02 3.7 NA NA 0.6 NA 0.2 NA

9/95 <0.1 0.2 <0.003 240 69 <5 10 <0.1 38 <0.05 NA <0.2 15 <0.005 23 142 466 <0.05 <0.025 4.9 NA NA 0.5 NA -0.1 1.8

4/95 <0.2 <0.2 0.001 210 73 <1 11 <0.1 37 <0.05 NA <0.2 16 <0.001 24 139 400 <0.05 <0.02 1.4 NA NA 0.3 NA -0.4 0.5

2/95 <0.1 1.6 0.003 220 70 <1 12 <0.1 39 <0.05 NA <0.2 17 <0.005 25 156 400 <0.05 <0.025 1.1 NA NA 0.3 NA -0.1 1.1

12/94 <0.1 <0.1 0.003 229 74 <1 13 <0.1 39 <0.05 NA <0.2 15 <0.005 23 167 440 <0.05 <0.025 3.6 NA NA 0.3 NA 0.1 0.6

8/94 <0.05 <0.1 0.003 222 72 <0.1 13 <0.02 38 0.02 <0.01 0.2 16 <0.001 26 160 440 <0.01 <0.005 3.7 NA NA 0.2 0.6 0.1 <0.2

5/94 <0.05 <1 0.002 213 69 <0.1 13 <0.02 39 <0.01 <0.01 <0.3 16 <0.001 24 170 440 <0.01 0.006 9.6 NA NA 0.4 1 0 0.3

2/94 <0.05 <0.2 0.005 206 73 <0.1 13 <0.02 41 0.01 <0.01 <0.2 17 <0.001 25 165 420 <0.01 0.006 3.9 NA NA 0 1.2 0 <0.2



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-6B

10/15/98 <0.1 298 NA 548 370 <5 354 NA 570 NA NA 44 44 NA 261 3430 5760 NA NA NA NA NA NA NA NA 59.576


5/26/98 <0.1 453 0.005 482 335 <5 321 <0.1 563 3.81 <0.01 46 47 0.049 303 3600 4920 <0.05 0.153 102 0 0 0.05 0.7 1.1 63.638

1/19/98 <0.1 180 <0.003 351 252 <5 188 <0.1 316 2.7 <0.01 27 31 0.034 174 2120 3410 <0.05 0.087 49 0.2 0.3 0.1 0 0 36.558

1/97 <0.1 222 <0.003 486 394 <5 388 <0.1 670 4.48 <0.01 204 45 0.066 311 4020 5370 <0.05 0.200 60 NA NA 0.7 1.1 -0.2 68

10/96 <0.1 202 <0.003 463 383 <5 353 <0.1 606 4.31 <0.01 294 49 0.069 344 3350 5260 <0.05 0.182 35 NA NA 0.2 2.4 0.2 66

9/96 <0.1 219 <0.003 482 388 <5 347 <0.1 606 4.18 <0.01 294 48 0.056 325 3580 4980 <0.05 0.192 9 NA NA 0.1 0.8 0.2 62

4/96 <0.1 208 <0.015 564 375 <5 350 <0.1 566 4.35 <0.01 314 47 0.056 310 3700 5580 <0.05 0.180 48 NA NA 0.2 0.9 0 66

3/96 <0.1 250 <0.003 525 354 <5 360 <0.1 644 4.58 <0.01 0.44 49 0.048 348 4100 5860 <0.05 0.180 39 NA NA 0.3 NA 0 74

11/95 <0.1 162 <0.003 418 322 <5 300 <0.1 489 3.71 <0.01 31 38 0.148 281 3150 4970 <0.05 0.145 72 NA NA 0.2 NA 0.2 45

8/95 <0.1 159 <0.003 430 340 <1 309 <0.1 481 3.52 <0.01 27 37 0.051 280 2930 4270 <0.05 0.149 48 NA NA -0.1 NA 0 49

4/95 <0.1 209 <0.003 448 368 <1 346 <0.1 543 4.49 NA 30 42 0.097 318 3460 5300 <0.05 0.190 52 NA NA 0 NA 0 48

2/95 <0.1 280 <0.02 582 473 <1 440 <0.1 824 6.05 NA 33 57 0.08 361 4810 7200 <0.05 0.287 75 NA NA 0.1 NA -0.2 62

11/94 <0.1 150 <0.003 402 358 <1 311 <0.01 450 3.47 <0.01 25 36 0.045 266 3010 4250 0.05 0.149 65 NA NA 0.1 NA 0.5 45

8/94 <0.05 2.2 <0.001 494 389 <0.1 383 <0.02 576 4.50 <0.01 36 45 0.06 353 3600 5170 0.03 0.193 64 NA NA 0 0.8 0.2 49

5/94 <0.05 308 <0.001 792 389 <0.1 422 <0.02 775 6.07 <0.01 46 53 0.081 365 4900 6940 <0.01 0.278 78 NA NA 0.2 0.6 0 69

2/94 <0.05 278 0.003 518 378 <0.1 396 <0.02 809 6.04 <0.01 41 53 0.073 388 4530 6280 <0.01 0.292 82 NA NA 0.3 1 0 57



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-6C



6/3/98 <0.1 793 0.006 610 425 <5 1180 <0.1 1660 14.6 <0.01 69 69 0.153 684 17700 15600 <0.05 0.26 14 -0.6 0.7 0.1 0.9 0.04 74.47

1/19/98 0.1 340 <0.003 522 320 <5 402 <0.1 683 7.92 <0.01 59 65 0.088 342 4910 5320 <0.05 0.303 98 -0.3 3.3 0.5 -0.2 0.5 67.7

1/97 0.20 521 <0.003 520 437.0 <5 586 <0.1 1280 13 <0.02 474 75 0.161 510 7600.0 8400.0 <0.05 0.56 60.0 NA NA 0.7 1.1 -0.2 66

10/96 <0.1 514 <0.003 580 442.0 <5 542 <0.1 1270 13 <0.01 484 75 0.157 480 6180.0 8260.0 <0.05 0.52 31.0 NA NA -0.3 0.3 0.3 74

9/96 <0.3 566 <0.003 596 416.0 <5 565 <0.3 1140 12 <0.05 454 80 0.142 503 7110.0 9560.0 <0.05 0.60 -15.0 NA NA 0.3 0.0 0.1 74

4/96 0.10 525 <0.015 618 404.0 <5 610 <0.1 1120 13 <0.02 464 84 0.127 478 7200.0 9780.0 <0.05 0.53 87.0 NA NA 0.2 0.9 0.0 81

3/96 0.20 520 <0.003 591 419 <5 550 <0.2 1240 14 <0.02 14 82 0.197 549 7200 9720 <0.05 0.59 84.0 NA NA 0.4 NA 0.1 95

11/95 0.20 513 <0.003 580 383 <5 570 <0.2 1150 13 <0.02 524 76 0.052 521 7600 10700 <0.05 0.59 45 NA NA 0.3 NA 0.1 55

8/95 <0.2 553 <0.003 558 384 <1 610 <0.2 1190 14 <0.02 46 72 0.185 520 7050 9940 <0.1 0.64 108 NA NA 0.1 NA 0.1 80

4/95 0.10 470 <0.003 574 406 <1 513 <0.2 999 12 NA 41 67 0.180 472 5600 8930 <0.05 0.53 88 NA NA 0.1 NA -0.1 70

3/95 <0.5 630 <0.02 640 407 <1 720 <0.5 1380 18 NA 59 79 0.250 606 8550 12400 <0.25 0.80 39 NA NA 0.1 NA 0 74

11/94 0.20 440 <0.003 554 388 <1 558 <0.1 1070 13 <0.01 43 65 0.100 450 6610 8590 <0.05 0.625 105 NA NA 0.1 NA 0.7 78

8/94 0.20 550 <0.001 590 444 <0.1 657 <0.04 1230 15 <0.02 56 78 0.170 560 7780 10600 <0.02 0.73 65 NA NA 0.2 0.2 0.1 54

5/94 0.40 655 0.021 856 454 <0.1 656 <0.04 1470 18 <0.02 70 86 0.189 628 7790 12700 <0.02 0.918 140 NA NA 0.1 0.9 2 67

2/94 0.30 616 0.002 589 424 <0.1 622 <0.02 1430 17 <0.01 57 83 0.192 567 7950 11060 <0.01 0.93 180 NA NA 0 0.9 0 56



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-7A

11/23/98 15.4 2330 NA 232 466 <5 2930 NA 6620 NA NA 94 126 NA 2290 36000 47000 NA NA NA NA NA NA NA NA 169.25

9/28/98 30 2550 NA 198 479 <5 2770 NA 6770 NA NA 117 104 NA 2220 35700 54100 NA NA NA NA NA NA NA NA 311.42

5/18/98 35.6 2800 <0.003 180 463 <5 50 4.5 7400 98.5 <0.01 149 117 1.35 2350 42600 58500 <0.05 16.4 612 0.2 0.7 0.6 0.9 0.09 223.41

3/10/98 57.5 2780 <0.015 174 482 <5 2980 6.2 7550 106 <0.05 63 114 1.53 2560 46500 61800 <0.05 19.4 240 1 0.4 1.8 2.2 0 338.5

12/96 122 2900 <0.015 220 508 <5 3360 7.4 8250 122 >0.1 674 124 1.4 2870 55200 60300 <0.1 28 400 NA NA 0.5 NA 6.0 582

9/96 148 3210 <0.003 169 506 <5 3360 9.0 8450 132 <0.2 704 116 1.3 3020 48800 63800 <0.2 30 289 NA NA 0.6 NA 1.2 460

6/96 166 2300 <0.003 136 492 <5 3120 10.0 8420 138 <0.1 654 119 1.5 2850 46500 65300 <0.1 33 878 NA NA 0.9 NA 1.8 548

4/96 150 2940 <0.015 122 491 <5 3400 11.0 8350 136 <0.1 664 140 1.6 3080 47000 64900 <0.1 34 1310 NA NA 2.7 NA 1.9 745

3/96 145 2730 <0.015 120 497 <5 3500 11.0 8670 139 <0.1 644 152 1.6 3090 46000 63800 <0.1 33 562 NA NA 0.7 NA 0.5 745

2/96 140 2800 <0.015 163 487 <5 3300 12.3 8930 144 0.1 594 149 1.5 3090 49000 68000 <0.1 35 506 NA NA 1.4 NA 0.8 623

1/96 141 2760 <0.015 308 502 <5 3500 14.0 8810 139 <0.1 <0.14 152 1.8 3080 49000 67800 <0.1 32 802 NA NA 1.4 NA 2.8 467

12/95 152 2890 <0.015 154 480 <5 3530 16.0 8990 142 <0.1 63 154 1.3 3090 51700 67900 <0.1 34 1050 NA NA 1.1 NA 0.4 330

8/95 141 2900 <0.015 32 473 <1 3410 27.0 8491 139 <0.2 61 156 1.7 2900 48600 67900 <1 33 433 NA NA 1.5 NA 0.0 655

4/95 86 2480 <0.02 108 526 <1 3170 45.0 8000 130 <0.1 48 164 1.6 2740 43700 57300 <0.5 28 384 NA NA 0.7 NA 1.2 424

8/94 249 3080 <0.01 38 530 <1 3690 20.1 8600 143 <0.1 64.6 149 1.5 3120 49900 67300 <0.1 40 1980 NA NA 0.1 4.9 2.2 597

5/94 255 3270 0.053 109 518 <0.1 3150 19.8 9120 151 <0.2 69.7 134 1.7 3260 51200 63400 <0.2 43 580 NA NA 0.4 2.3 13.0 1100

2/94 351 3370 <0.005 124 556 <0.1 3610 21.3 9500 155 <0.2 64.4 140 2.0 3370 61900 73600 <0.2 48 710 NA NA 0.9 5.4 7.3 1050



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-7B

11/23/98 <0.1 1270 NA 1460 445 <5 2610 NA 2800 NA NA 0.4 229 NA 795 13900 19800 NA NA NA NA NA NA NA NA 19.633


6/4/98 <0.1 995 0.006 292 471 <5 1330 0.4 2990 11.6 <0.01 1.9 222 <0.005 758 15700 22000 <0.05 0.3 68 -0.6 0.1 0.3 4.1 -0.05 29.111

3/10/98 <0.1 855 <0.015 1460 465 <5 1150 0.9 2920 11.6 <0.05 <0.5 203 <0.025 708 15800 31400 0.02 0.32 93 0.6 0.2 0.2 5.6 0 17.602

12/96 <0.3 923 <0.015 1550 495 <5 1190 1 3060 12.1 <0.05 <0.44 244 <0.005 790 15900 21600 <0.05 0.39 -45 NA NA 0.3 4.6 0.0 40

9/96 <0.3 1060 <0.003 1580 489 <5 1240 <0.3 3340 12.6 <0.05 <0.14 247 <0.050 881 8080 21900 <0.05 0.5 64 NA NA 0.2 4.3 -0.1 62

6/96 <0.3 920 <0.015 1600 466 <5 1170 <0.5 3180 12.4 <0.05 0.34 215 <0.025 787 16400 21800 <0.05 0.6 57 NA NA 0.3 2.9 0.0 45

3/96 <0.3 1020 <0.003 1700 456 <5 1200 <0.5 3180 12.8 <0.05 0.94 222 0.045 852 17000 22300 <0.05 0.8 137 NA NA 0.3 3.5 7.0 122

2/96 <0.3 1270 <0.015 1930 455 <5 1350 <0.5 5310 15.6 <0.05 2.64 233 0.132 928 18600 25600 <0.05 1.3 282 NA NA 0.6 NA 0.2 143

1/964 <0.3 1420 <0.003 2090 437 <5 1590 <0.5 3830 19.0 <0.05 4.04 244 0.114 1050 20100 29900 <0.05 1.7 272 NA NA 0.2 NA 0.1 265

12/95 <0.3 1420 <0.003 2090 437 <5 1590 <0.5 3830 19.0 <0.05 40.4 244 0.114 1050 20100 29900 <0.05 1.7 272 NA NA 0.2 NA 0.1 265

11/95 <0.3 1400 <0.003 2260 424 <5 1740 <0.1 4320 21.2 <0.05 4.74 256 0.128 1060 23400 32500 <0.05 2.3 325 NA NA 0.2 NA 0.3 330

8/95 <0.5 1660 <0.003 2150 477 <5 1570 3.0 4120 20.0 <0.05 3.9 254 0.151 1090 22500 30300 <0.25 2.1 484 NA NA 0.4 NA 0.1 303

4/95 <0.5 1960 <0.02 2050 537 <1 1800 6.0 4580 25.4 NA 9.6 248 0.350 1250 24200 33000 <0.1 3.1 672 NA NA 0.1 NA -0.1 312

3/95 <0.5 1740 <0.03 2000 511 <1 1800 4.7 4470 23.7 NA 7.6 254 0.120 1240 22600 32200 <0.25 2.6 265 NA NA 0.3 NA 0.1 282

8/94 <0.25 1510 <0.01 1925 496 <1 1610 <0.1 4050 21.4 <0.05 9.2 238 0.150 1130 21400 28900 0.06 2.1 529 NA NA 0.1 3.8 0.0 119

5/94 <1 1450 <0.001 1732 501 <0.1 1360 1.9 3760 20.3 <0.2 7.0 221 0.097 1090 21400 25500 <0.2 2.1 390 NA NA 0.3 3.8 0.0 160

2/94 0.8 2660 <0.005 2190 534 <0.1 2430 7.5 6440 47.8 <0.1 34.9 255 0.360 1830 36400 43600 <0.1 7.5 230 NA NA 0.4 4.2 0.0 220



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-7C



5/20/98 1.2 2190 0.004 1200 507 <5 2480 <0;1 6550 55.4 0.2 64 217 0.665 1990 37800 51500 <0.05 5.3 474 0.5 0.7 0.3 1.2 0.2 412.97

3/4/98 0.7 2410 <0.015 1850 513 <5 2200 1.1 5470 30 <0.1 43 218 0.69 1710 30100 40300 <0.1 4 375 0.6 0.8 0.2 -0.1 0.1 419.74

12/96 0.8 1570 <0.003 2130 566 <5 1870 20.9 5270 29 <0.1 104 229 0.52 1560 30700 34800 <0.1 5.2 396 NA NA 0.2 NA 0.2 542

9/96 0.9 1580 <0.015 2020 527 <5 1920 27.9 5000 30 <0.1 124 224 0.45 1490 25800 35200 <0.1 5.2 1050 NA NA 0.2 NA 0.1 535

6/96 0.8 1700 <0.003 2000 516 <5 1990 20.0 5250 34 <0.1 204 222 0.53 1570 27100 36800 <0.1 6.2 1030 NA NA 0.8 NA 1.0 250

3/96 1.0 2440 <0.015 1750 520 <5 2700 2.0 6880 52 <0.1 634 265 0.97 2190 35000 48200 <0.1 7.8 574 NA NA 0.3 NA 0.8 432

11/95 0.4 1450 <0.030 400 480 <5 1910 22.8 4400 25 <0.05 154 218 0.50 1360 25500 35300 <0.05 3.6 410 NA NA 0.3 NA 0.7 376

8/95 0.5 1340 <0.003 2060 474 <5 1750 22.5 4490 24 <0.05 9 223 0.51 1340 24000 32600 <0.25 3.9 562 NA NA 0.4 NA 0.0 309

4/95 1.0 1880 <0.02 1800 502 <1 1890 18.0 5060 34 <0.1 17 227 0.35 1520 25600 36700 <0.5 5.9 568 NA NA 0.1 NA 0.0 185

2/95 7.0 2260 <0.003 1290 496 <1 2460 24.0 5930 71 NA 26 76 0.86 1880 33700 46700 <0.5 16.4 521 NA NA 0.2 NA 0.6 201

8/94 2.5 2200 <0.01 1380 484 <1 2230 22.7 5400 50 <0.1 19 232 0.39 1690 31100 39400 <0.1 9.0 588 NA NA 0.1 1.1 0.0 305

5/94 123.0 3130 0.002 130 484 <0.1 2760 11.3 7320 113 <0.2 78 175 0.91 2770 42100 56200 <0.2 31.3 1100 NA NA 0.4 2.1 0.7 620

2/94 3.7 2450 <0.005 1380 506 <0.1 2330 12.6 6350 62 <0.1 28 233 1.99 1870 33300 42100 <0.1 14.2 570 NA NA 0.4 1.2 0.0 300



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-8A



6/25/98 <0.1 98 <0.003 381 246 <5 282 <0.1 552 4.46 <0.01 17 42 0.063 210 3370 4870 <0.05 0.152 54 -0.4 0.2 0.07 0.5 0.02 74.47

1/14/98 0.1 771 <0.003 293 329 <5 449 <0.1 910 12.2 <0.02 70 68 0.115 405 6190 8670 <0.05 0.468 165 0.4 0.2 0.1 1.7 0 74.47

1/97 0.2 416 <0.003 526 350 <5 437 <0.1 1080 8 <0.02 6.04 64 0.118 371 5610 8390 <0.05 0.34 122 NA NA 0.2 1.8 -0.1 129

10/96 <0.1 372 <0.003 502 364 <5 432 <0.1 1040 9 <0.02 3.84 60 0.111 383 5850 8390 <0.05 0.33 146 NA NA 0.1 -0.7 0.1 115

8/96 <0.1 326 <0.003 492 307 <5 360 <0.1 788 7 <0.01 3.34 52 0.078 290 4690 6380 <0.05 0.25 111 NA NA 0.0 -1.1 0.1 95

4/96 <0.1 375 <0.003 448 329 <5 420 <0.1 935 8 <0.01 5.04 57 0.106 371 5500 7650 <0.05 0.33 84 NA NA 0.1 1.9 0.1 108

2/96 <0.1 346 <0.003 460 321 <5 380 <0.1 807 7 <0.01 9.24 52 0.077 311 4800 6670 <0.05 0.29 79 NA NA 0.0 NA 0.0 74

11/95 <0.1 550 <0.003 540 351 <5 690 <0.1 1560 13 <0.02 32.04 73 0.170 582 9100 13100 <0.05 0.55 178 NA NA 0.2 NA 0.2 202

7/95 <0.2 620 <0.003 590 418 <1 693 <0.1 1640 15 <0.02 14.4 75 0.222 676 9140 14100 <0.1 0.78 164 NA NA -0.2 NA 0.5 213

4/95 <1 1280 <0.005 514 457 <1 1360 <1 3910 33 <0.1 17.5 128 0.803 1240 21400 28900 <0.05 1.10 734 NA NA 0.1 NA 0.0 395

2/95 <0.5 270 <0.003 611 518 <1 949 <0.5 2430 33 NA 10.7 103 0.450 846 13400 17100 <0.25 1.48 244 NA NA 0.1 NA 0.0 236

8/94 8.0 1540 <0.005 240 486 <0.1 1750 <0.1 4550 65 <0.05 3.8 133 0.525 1600 25700 53200 <0.05 7.41 491 NA NA 0.2 0.9 0.0 161

5/94 0.5 662 0.008 796 369 <0.1 641 <0.04 1460 15 <0.02 9.0 72 0.144 586 10500 12200 <0.02 0.92 60 NA NA 0.0 0.3 0.0 85

2/94 14.5 1470 0.003 399 541 <0.1 1440 <0.02 4240 79 <0.01 24.1 120 0.637 1450 22700 29460 <0.01 13.30 280 NA NA 0.2 1.5 1.0 420



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-8B

11/4/98 <0.1 3.1 NA 318 174 <5 97 NA 159 NA NA <0.1 31 NA 85 962 1740 NA NA NA NA NA NA NA NA 9.478

9/21/98 <0.1 35 NA 322 176 <5 109 NA 156 NA NA <0.1 27 NA 88 1070 1690 NA NA NA NA NA NA NA NA 7.447

6/25/98 <0.1 4.5 <0.003 326 192 <5 116 <0.1 192 0.85 <0.01 <0.1 33 <0.005 80 1220 1920 <0.05 0.026 17 -0.4 -0.1 0.4 1.2 0.3 10.155

1/14/98 <0.1 132 <0.003 390 250 <5 123 <0.1 264 1.42 <0.01 0.1 45 <0.005 128 1390 2900 <0.05 0.026 22 -0.3 0.1 0.2 -0.7 0 16.248

1/97 <0.1 47 <0.003 328 201 <5 100 <0.1 202 0.91 <0.01 <0.14 31 <0.005 85 1110 1860 <0.05 0.03 9 NA NA 0.4 5.6 -0.1 11

10/96 <0.1 50 <0.003 351 206 <5 109 <0.1 203 0.98 <0.01 <0.14 32 <0.005 87 1150 1930 <0.05 0.03 17 NA NA 0.2 1.1 0.0 9

8/96 <0.1 52 <0.003 356 210 <5 121 <0.1 209 0.99 <0.01 <0.14 34 <0.005 86 1160 1910 <0.05 0.04 12 NA NA 0.2 0.4 0.2 1

4/96 <0.1 52 <0.003 340 218 <5 126 <0.1 221 1.05 <0.01 <0.14 35 <0.005 99 1300 2040 <0.05 0.03 17 NA NA 0.3 2.7 0.1 12

2/96 <0.1 58 <0.003 360 251 <5 123 <0.1 232 1.16 <0.01 <0.14 37 <0.005 102 1370 2170 <0.05 0.04 10 NA NA 0.2 NA 0.0 13

11/95 <0.1 68 <0.003 384 266 <1 165 <0.1 303 1.42 <0.01 0.14 40 <0.005 125 1820 3000 <0.05 0.05 14 NA NA 0.2 NA 0.0 19

7/95 <0.1 79 <0.003 414 326 <1 171 <0.1 336 1.67 NA 0.3 42 <0.005 147 1940 3230 <0.05 0.06 18 NA NA 0.2 NA 0.3 18

4/95 <0.1 123 <0.001 444 329 <1 205 <0.1 445 2.81 <0.01 0.6 48 0.012 160 2700 3640 <0.05 0.13 20 NA NA 0.3 NA -0.1 21

2/95 <0.1 58 <0.003 357 235 <1 142 <0.1 259 1.39 NA <0.1 37 <0.005 103 1590 2590 <0.1 0.06 16 NA NA 0.1 NA 0.0 12

11/94 <0.1 100 <0.001 418 325 <1 187 <0.1 388 2.30 <0.01 0.8 53 0.004 136 2320 3550 <0.05 0.12 0 NA NA 0.3 NA 0.1 17

8/94 <0.05 73 <0.001 414 288 <0.1 160 <0.02 281 1.54 <0.01 0.7 39 0.002 117 1840 2810 <0.01 0.06 19 NA NA 0.2 1.0 0.0 12

5/94 <0.05 61 <0.001 363 239 <0.1 113 <0.02 222 1.15 <0.01 <0.3 35 <0.001 94 1380 2230 <0.01 0.04 16 NA NA 0.1 1.0 0.0 10

2/94 <0.05 71 0.002 389 258 <0.1 133 <0.02 273 1.48 <0.01 0.2 38 0.005 104 1560 2450 <0.01 0.06 18 NA NA 0.1 1.8 0.0 13



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-8C



6/25/98 <0.1 55 <0.003 412 287 <5 179 0.4 336 1.8 <0.01 <0.1 45 <0.005 110 2240 3360 <0.05 0.056 22 0.1 0.1 0.6 1.2 0.07 15.571

1/14/98 <0.1 228 <0.003 442 316 <5 204 0.2 348 2 <0.01 <0.1 56 <0.005 146 2620 3830 <0.05 0.058 68 0.3 0.3 0.4 3.2 0 15.571

1/97 <0.1 111 0.050.0 418 321 <5 161 0.40 389 1.9 <0.01 <0.14 52 <0.010 129 2200 3300 <0.05 0.07 30 NA NA 0.4 1.6 0.0 16

10/96 <0.1 104 <0.003 433 323 <5 169 0.30 369 2.0 <0.01 0.24 52 <0.005 130 2050 3120 <0.05 0.06 6 NA NA 0.1 2.6 0.0 14

8/96 <0.1 110 <0.003 432 322 <5 182 0.30 383 2.1 <0.01 0.24 50 <0.005 123 2090 3330 <0.05 0.07 26 NA NA 0.3 2.2 0.0 16

4/96 <0.1 101 <0.003 436 312 <5 180 0.20 362 2.0 <0.01 <0.14 51 <0.005 134 2200 3420 <0.05 0.06 12 NA NA 0.3 2.5 0.1 14

2/96 <0.1 110 <0.003 494 311 <5 184 0.20 357 2.0 <0.01 <0.14 50 <0.005 139 2260 3460 <0.05 0.06 9 NA NA 0.3 NA 0.0 23

11/95 <0.1 107 <0.003 462 357 <5 190 <0.2 448 2.4 <0.01 0.14 57 <0.005 152 2570 3920 <0.05 0.08 30 NA NA 0.2 NA 0.0 22

7/95 <0.1 103 <0.003 476 388 <1 200 0.10 430 2.2 NA <0.4 55 <0.005 164 2430 4020 <0.05 0.08 10 NA NA 0.2 NA 0.3 16

4/95 <0.1 120 <0.001 478 337 <1 195 0.30 418 2.6 <0.01 0.2 53 0.003 147 2500 4080 <0.05 0.08 15 NA NA 0.1 NA 0.1 18

2/95 <0.1 99 <0.003 422 324 <1 194 0.50 386 2.5 NA <0.2 49 <0.005 136 2460 3600 <0.05 0.09 14 NA NA 0.1 NA 0.2 7

11/94 <0.1 115 <0.001 458 359 <1 194 0.20 422 2.3 <0.01 0.6 51 <0.002 147 2590 3850 <0.05 0.09 18 NA NA 0.1 NA -0.2 17

8/94 <0.05 110 <0.001 480 345 <0.1 192 0.43 377 2.1 <0.01 0.6 54 <0.001 140 2330 3590 <0.01 0.08 25 NA NA 0.1 2.2 0.0 13

5/94 <0.05 126 0.006 462 344 <0.1 180 0.62 388 2.2 <0.01 <1 55 <0.001 136 2470 3560 <0.01 0.09 27 NA NA 0.2 2.1 0.0 17

2/94 <0.05 116 0.003 440 332 <0.1 180 0.59 392 2.1 <0.01 0.2 53 0.003 136 2320 3420 <0.01 0.10 24 NA NA 0.3 2.7 0.3 16



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-9A



6/4/98 <0.1 589 0.007 540 301 <5 489 <0.1 955 7.45 <0.01 178 58 <0.005 397 7610 7810 <0.05 0.67 234 0.3 0.3 0.2 1.3 -0.1 311.42

1/21/98 <0.1 560 <0.003 606 315 <5 423 <0.1 890 8.03 <0.01 243 54 0.169 377 5790 8230 <0.05 0.689 318 0.5 0.1 0.1 0.8 0.1 324.96

1/97 <0.1 326 <0.003 571 335 <5 356 <0.1 985 7.1 <0.02 794 51 0.13 358 4810 7030 <0.05 0.7 367 NA NA 0.3 -0.8 -0.1 291

10/96 <0.1 294 <0.003 578 332 <5 343 <0.1 953 6.9 <0.01 784 56 0.15 354 4690 7010 <0.05 0.6 411 NA NA 0.1 1.6 2.5 264

9/96 <0.1 243 <0.003 540 275 <5 296 <0.1 719 5.4 <0.01 684 45 0.12 309 4010 5920 <0.05 0.5 197 NA NA 0.1 2.6 0.5 257

6/96 <0.1 240 0.0003 564 254 <5 304 <0.1 671 5.0 <0.01 554 45 0.13 311 4210 5860 <0.05 0.4 323 NA NA 0.5 2.2 0.2 264

3/96 <0.3 270 <0.0003 522 295 <5 300 <0.5 818 5.9 <0.05 694 55 0.12 334 4500 6640 <0.05 0.5 382 NA NA 0.7 1.2 <0.1 325

12/95 <0.1 311 0.003 624 302 <5 1710 <0.1 868 6.2 <0.01 764 56 <0.025 360 4700 6990 <0.05 0.6 260 NA NA 0.2 NA 0.2 253

8/95 <0.1 294 <0.003 570 296 <1 318 <0.1 762 5.1 <0.01 57 53 0.12 375 4390 6390 <0.05 0.5 285 NA NA 0.2 NA 0.1 259

4/95 <0.2 450 <0.003 645 341 <1 498 <0.2 1280 9.5 NA 104 66 0.28 502 6590 9720 <0.1 0.9 423 NA NA 0.7 NA 0.0 321

2/95 <0.2 490 <0.002 744 382 <1 639 <0.2 1570 11.1 NA 124 79 0.20 574 8160 1200 <0.1 1.1 498 NA NA 0.2 NA -0.1 232

11/94 <0.1 435 0.0090 624 388 12 488 <0.01 1420 11.4 <0.025 115 69 0.20 549 7000 9470 <0.05 1.1 415 NA NA 0.0 NA 0.3 336

8/94 <0.1 374 0.0010 599 307 <0.1 420 <0.04 937 6.5 <0.02 80 61 0.16 419 5570 7950 <0.02 0.6 373 NA NA 0.3 0.9 0.1 295

5/94 <0.1 538 0.0010 610 371 <1 540 <0.04 1260 8.5 <0.02 63 71 0.21 467 7490 9860 <0.02 0.8 340 NA NA 0.0 1.1 0.0 260

2/94 <0.05 437 0.0340 590 339 <0.1 470 <0.02 1230 8.0 <0.01 110 72 0.22 479 6500 9260 <0.01 0.8 310 NA NA 0.3 2.9 1.2 300



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ss A

lpha

(pC

i/L)

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-9B



6/18/98 <0.1 636 <0.003 454 219 <5 238 <0.1 525 3.15 <0.01 0.6 67 0.021 186 3160 4820 <0.05 0.256 67 -0.1 0.8 0.06 2.5 -0.08 65.669

1/20/98 <0.1 300 <0.003 448 212 <5 241 0.3 400 2.56 <0.01 1.3 59 <0.005 149 3310 4460 <0.05 0.167 49 0.2 0.2 0.2 1.3 0 37.235

1/97 <0.1 346 <0.003 476 261 <5 249 <0.1 627 3.5 <0.01 0.44 62 0.015 183 3220 4810 <0.05 0.31 43 NA NA 0.6 1.0 0.2 68

10/96 <0.1 254 <0.003 509 302 <5 268 <0.1 607 3.4 <0.01 0.24 98 0.011 218 3350 4490 <0.05 0.29 58 NA NA 0.1 1.2 0.0 46

9/96 <0.1 244 <0.003 498 290 <5 279 <0.1 563 3.3 <0.01 0.24 71 <0.025 183 3580 4600 <0.05 0.28 56 NA NA 0.2 3.4 0.3 45

5/96 <0.1 240 <0.003 484 274 <5 273 <0.1 548 3.3 <0.01 0.24 68 0.012 184 3570 4900 <0.05 0.26 70 NA NA 0.8 2.9 0.1 55

3/96 <0.3 231 <0.003 480 268 <5 220 <0.5 543 3.4 <0.05 0.34 64 <0.005 182 3300 4550 <0.05 0.30 45 NA NA 0.5 2.3 0.2 56

12/95 <0.1 246 <0.003 470 248 <5 240 <0.1 564 3.4 <0.01 0.34 69 0.021 183 3360 4700 <0.05 0.27 37 NA NA 0.4 NA 0.1 56

8/95 <0.1 238 <0.003 474 306 <1 232 <0.1 500 3.0 <0.01 <0.4 66 0.008 178 3120 4610 <0.05 0.25 76 NA NA 0.3 NA -0.1 36

4/95 <0.1 229 <0.003 445 258 <1 228 0.30 493 3.1 NA 0.2 64 0.005 160 2940 4160 <0.05 0.24 53 NA NA -0.7 NA 0.1 34

1/95 <0.1 300 <0.003 512 273 <1 292 <0.1 655 4.5 NA 0.4 75 0.022 222 3971 5360 <0.05 0.37 94 NA NA 1.1 NA 0.1 62

11/94 <0.1 231 0.006 472 312 <1 245 0.70 544 3.4 <0.01 <0.4 8 0.004 172 3310 4400 <0.05 0.30 80 NA NA 0.1 NA 0.7 34

8/94 <0.05 234 <0.001 460 293 <1 244 0.04 503 3.2 <0.01 <2 65 0.005 161 3260 4480 <0.01 0.26 57 NA NA 0.1 2.0 0.1 27

5/94 <0.05 300 0.014 444 256 <1 272 <0.02 596 4.2 <0.01 0.3 67 0.012 179 3725 4840 <0.01 0.45 74 NA NA 0.0 2.3 0.0 48

2/94 <0.05 251 0.013 438 264 <0.1 230 <0.02 543 3.4 <0.01 <0.2 67 0.005 167 3110 4390 <0.01 0.32 71 NA NA 0.4 2.7 0.2 34



San Miguel River Valley Kayenta - Wingate Sequence Monitoring Wells 1994-1998(Excerpted from Revised 1996 and 1998 Annual Environmental Monitoring Reports, Umetco Minerals Corp., Uravan, CO

Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)

CRP-9C



6/22/98 <0.1 166 <0.003 530 274 <5 411 <0.1 963 7.09 <0.01 4.6 85 0.102 288 5640 8090 <0.05 0.84 100 -0.4 0.7 0.3 1.9 -0.04 135.4

1/20/98 <0.1 500 <0.003 495 262 <5 311 0.1 643 5.03 <0.01 0.7 76 0.033 215 4340 5850 <0.05 0.455 143 -0.1 0 0.2 2.1 -0.1 64.315

1/97 <0.1 275 <0.003 547 339 <5 407 <0.1 1080 8.1 <0.02 1.94 84 0.073 296 2170 7650 <0.05 0.95 159 NA NA 0.6 2.0 0.0 108

10/96 <0.1 242 <0.003 503 318 <5 265 0.5 610 4.3 <0.01 0.14 76 0.010 208 3450 4430 <0.05 0.42 51 NA NA 0.2 0.0 0.1 41

9/96 <0.1 251 <0.003 498 309 <5 269 0.4 574 4.0 <0.01 0.24 73 <0.005 189 3650 4910 <0.05 0.40 10 NA NA 0.3 3.2 0.1 40

5/96 <0.1 250 <0.003 450 286 <5 265 <0.1 598 4.5 <0.01 0.24 75 0.015 210 3550 4550 <0.05 0.47 31 NA NA 1.3 2.4 0.0 47

3/96 <0.3 265 <0.003 500 262 <5 250 <0.5 591 4.3 0.05 0.34 73 <0.010 194 3600 4840 <0.05 0.50 101 NA NA 0.6 2.0 0.1 60

11/95 <0.1 593 <0.015 724 335 <5 590 <0.2 1450 9.4 <0.02 6.54 109 0.147 456 8500 11700 <0.05 1.30 146 NA NA 0.7 0.0 0.1 232

8/95 <0.1 266 <0.003 484 322 <1 268 <0.1 552 3.8 <0.01 <1.5 70 0.007 211 3610 5040 <0.05 0.42 91 NA NA 0.0 0.0 -0.1 42

4/95 <0.2 480 0.003 595 318 <1 442 <0.2 1180 9.5 NA 1.7 105 0.080 357 5900 8080 <0.1 1.20 174 NA NA 1.3 0.0 0.0 112

1/95 <0.1 800 <0.003 990 364 <1 734 <0.02 1800 15.1 NA 6.3 151 0.198 684 10500 13800 <0.05 2.13 334 NA NA 2.4 0.0 0.0 313

11/94 <0.1 366 0.004 553 370 <1 367 <0.1 814 6.6 <0.01 1.3 83 0.032 251 4930 6760 <0.05 0.81 111 NA NA 0.3 0.0 0.4 62

8/94 <0.05 267 <0.001 510 326 <1 299 <0.02 616 4.8 <0.01 <2 71 0.010 192 3940 5200 0.02 0.53 56 NA NA 0.1 1.4 0.0 36

5/94 <0.1 711 <0.001 638 350 <1 584 <0.04 1520 11.1 <0.02 6.0 112 0.122 430 8370 11300 <0.02 1.86 260 NA NA 0.4 3.0 0.0 160

2/94 <0.05 414 0.01 538 310 <0.1 383 <0.02 967 7.4 <0.01 1.5 92 0.040 290 5520 7030 <0.01 1.07 42 NA NA 0.4 3.1 0.0 86



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-16


9/96 <0.1 23.0 <0.003 281 214 <5 108 3.0 182 0.23 <0.01 <0.2 32 <0.005 81 1040 1760 <0.05 <0.025 48 NA NA 0.1 0.3 0.1 0.7

8/95 <0.1 1.3 <0.003 290 208 <1 88 0.6 88 2.13 0.01 <0.2 18 <0.005 84 562 1320 <0.05 <0.025 9 NA NA 0.0 1.4 -0.1 4.4


CRP-17


9/15/98 <0.1 0.05 NA 232 96.5 <5 38 NA 34.4 NA NA <0.1 12 NA 34 199 550 NA NA NA NA NA NA NA NA <0.6093

6/22/98 <0.1 0.3 0.004 222 128 <5 49 0.8 54.7 0.05 <0.01 0.1 14 <0.005 41 356 794 <0.05 <0.025 8.5 -0.3 0.4 0.1 0.2 -0.2 2.6403

2/10/98 <0.1 1.1 0.004 225 130 <5 47 0.8 53.9 0.05 <0.01 <0.1 14 <0.005 42 345 744 <0.05 <0.025 2.3 -0.2 0.4 0.3 0.5 0 3.2496

2/97 <0.1 0.12 0.004 202 97 <5 32 0.50 36.0 <0.05 <0.01 <0.14 12.0 <0.005 35.0 176 440 <0.05 <0.025 6.0 NA NA 0.3 0.2 0.0 0.00

11/96 <0.1 0.10 <0.003 208 79 <1 31 0.40 29.5 <0.05 <0.01 <0.14 10.0 <0.005 35.0 129 402 <0.05 <0.025 1.5 NA NA 0.2 0.5 1.2 1.02

9/96 <0.1 0.10 <0.003 228 80 <5 32 0.4 28.7 <0.05 <0.01 <0.14 10.0 <0.005 35.0 135 434 <0.05 <0.025 9.7 NA NA 0.3 0.1 0.5 <0.6

6/96 <0.1 0.10 <0.003 210 75 <5 29 0.4 27.7 <0.05 <0.01 <0.14 10.0 <0.005 33.0 100 376 <0.05 <0.025 2.2 NA NA 0.3 2.5 0.0 1.76

3/96 <0.1 0.20 <0.003 210 82 <5 31 0.4 31.8 <0.05 <0.01 <0.14 10.0 <0.005 37.0 133 378 <0.05 <0.025 0.8 NA NA 0.3 NA <0.1 6.16

9/95 <0.1 0.30 0.004 212 72 <5 28 0.30 26.0 <0.05 <0.01 <0.2 10.0 <0.005 34.0 104 428 <0.05 <0.025 1.0 NA NA 0.5 NA 0.0 <0.2

4/95 <0.1 2.90 0.003 220 95 <1 39 0.50 45.9 0.06 <0.01 <0.2 14.0 <0.005 41.0 228 592 <0.05 <0.025 2.7 NA NA 0.4 NA 0.7 1.56

2/95 <0.1 5.00 <0.003 225 112 <1 50 0.60 60.2 0.11 NA <0.2 15.0 <0.005 43.0 351 728 <0.05 <0.02 1.8 NA NA 0.0 NA 0.0 4.06

8/94 <0.05 <0.1 <0.001 222 71 <1 29 <0.02 24.4 0.02 <0.01 <0.2 9.4 <0.001 32.6 101 370 <0.01 <0.005 0.6 NA NA 0.1 -0.1 0.0 <0.2

5/94 <0.05 1.90 0.003 214 103 <1 39 0.52 42.3 0.04 <0.01 0.1 11.7 <0.001 34.7 246 590 <0.01 0.006 5.6 NA NA 0.0 0.5 0.0 2.40

2/94 <0.05 4.20 0.003 220 99 <0.1 38 0.53 49.3 0.06 <0.01 <0.2 14.0 <0.001 38.0 265 580 <0.01 0.01 6.7 NA NA 0.3 1.1 0.2 1.3



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-18



6/23/98 <0.1 0.03 0.003 205 126 <5 190 0.3 47.2 <0.05 <0.01 <0.1 13 <0.005 99 251 880 <0.05 <0.025 13 0.1 0.3 0.3 0.8 -0.2 14.217

3/3/98 <0.1 <0.01 <0.003 195 124 <10 175 0.3 46 <0.05 <0.01 <0.1 12 <0.005 91 219 828 <0.05 <0.025 20 0 0.8 0.1 0.1 -0.1 12.186

2/97 <0.1 0.07 0.003 198 135 <5 195 0.30 51 <0.05 <0.01 0.104 13.0 <0.005 108 272 848 <0.05 <0.025 25.0 NA NA 0.4 1.2 0.0 14.2

11/96 <0.1 0.10 <0.003 211 138 <5 193 0.40 53 <0.05 <0.01 <0.14 13.0 <0.005 116 276 1080 <0.05 <0.025 8.0 NA NA 0.6 -0.1 -0.1 14.2

9/96 <0.1 0.10 <0.003 212 138 <5 203 0.40 50 <0.05 <0.01 <0.14 12.0 <0.005 104 313 858 <0.05 <0.025 5.7 NA NA 0.3 0.1 -0.1 12.2

6/96 <0.1 0.14 0.004 210 130 <5 185 0.40 47 <0.05 <0.01 <0.14 12.0 <0.005 108 254 774 <0.05 <0.025 12.0 NA NA 0.5 2.4 -0.1 13.5

2/96 <0.1 0.20 0.003 220 122 <5 182 0.40 46 <0.05 <0.01 <0.14 11.0 <0.005 99 220 796 <0.05 <0.025 5.7 NA NA 0.3 NA 0.0 4.0

12/95 <0.1 0.20 <0.003 216 121 <5 177 0.40 44 <0.05 <0.01 <0.14 12.0 <0.005 99 212 778 <0.05 <0.025 3.2 NA NA 0.2 NA 0.0 8.1

8/95 <0.1 2.70 0.003 216 129 <1 182 0.40 48 <0.05 <0.01 <0.2 13.0 <0.005 108 253 870 <0.05 <0.025 13.0 NA NA 0.0 NA -0.1 11.8

4/95 <0.1 0.10 <0.003 210 108 <1 167 0.50 39 <0.05 NA <0.2 11.0 <0.005 85 167 1390 <0.05 <0.02 1.4 NA NA 0.5 NA -0.1 6.5

2/95 <0.1 <0.5 <0.003 202 108 <1 172 0.50 39 <0.05 NA <0.2 11.0 <0.005 83 174 700 <0.05 <0.02 5.8 NA NA 0.2 NA -0.2 17.8

8/94 <0.05 <0.1 0.003 214 117 <0.1 171 0.50 40 0.01 <0.01 <0.2 11.4 <0.001 96 218 720 <0.01 0.01 14.0 NA NA 0.1 0.1 0.0 6.4

5/94 <0.05 <0.5 0.003 206 111 <1 192 0.53 44 0.01 <0.01 <0.2 11.3 <0.001 94 233 790 <0.01 <0.005 19.0 NA NA 0.1 0.5 0.5 6.7

2/94 <0.05 <0.2 0.003 201 106 <0.1 164 0.55 43 0.01 <0.01 <0.2 11.9 <0.001 90 180 700 <0.01 0.01 14.0 NA NA 0.3 1.0 0.0 5.8



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-19A



5/20/98 0.1 415 0.004 580 421 <5 429 <0.1 1030 14.3 <0.01 18.5 42 0.149 324 6920 9220 0.07 1.11 90 0.0 0.5 0.06 0.7 0.2 121.63

3/25/98 0.2 500 <0.015 578 439 <5 455 0.3 1710 20.7 <0.02 19 69 0.23 603 6780 9490 0.13 1.98 119 -0.3 0 0.7 0.4 0.1 128.63

3/97 0.2 364 <0.003 550 537 <5 366 <0.1 1020 20.0 <0.02 124 30 0.20 391 5510 8020 0.10 1.3 130 NA NA 0.1 1.1 0.0 58

11/96 0.3 383 <0.003 407 532 <5 406 <0.1 1160 24.7 <0.02 284 16 0.17 466 6580 8960 0.11 1.8 58 NA NA 0.2 2.4 0.1 58

8/96 0.3 278 <0.003 406 502 <5 277 <0.1 742 18.5 <0.01 204 12 0.20 334 4790 6670 0.09 1.4 50 NA NA 0.3 0.4 0.1 45

5/96 0.2 260 <0.003 440 510 <5 260 <0.1 644 17.4 0.01 194 11 0.15 285 4870 6620 0.09 1.2 26 NA NA 0.4 1.3 0.0 45

3/96 0.4 289 <0.003 480 512 <5 270 <0.5 731 19.6 <0.05 224 15 0.17 314 5100 7570 0.10 1.4 42 NA NA 0.2 2.0 0.1 47

9/95 0.3 320 <0.003 460 488 <5 356 <0.1 812 20.9 <0.01 37 15 0.21 370 5340 7430 0.09 1.1 63 NA NA 0.1 NA -0.1 49

4/95 0.6 513 <0.005 562 484 <1 530 <0.2 1430 28.0 <0.02 31.5 30 0.41 568 8170 11800 0.10 2.7 56 NA NA 0.2 NA 0.0 95

3/95 0.3 340 <0.003 526 492 <1 373 <0.1 918 24.2 NA 21 15 0.30 426 5870 8010 0.10 1.8 69 NA NA 0.0 NA 0.1 55

12/94 0.6 600 <0.003 588 488 <1 833 0.50 1860 41.7 NA 29 33 0.33 729 11000 12500 0.18 3.4 83 NA NA 0.0 NA -0.1 76

8/94 0.3 254 <0.001 475 485 <1 273 0.09 658 19.9 <0.01 25 11 0.18 315 4910 6720 0.08 1.7 68 NA NA 0.2 0.4 0.0 34

5/94 0.5 370 <0.001 486 528 <1 286 0.17 826 22.1 <0.01 27 15 0.28 370 5600 7140 0.09 1.9 67 NA NA 0.0 0.1 0.0 40

2/94 0.4 419 <0.005 750 509 <0.1 296 0.03 870 23.8 <0.01 31 17 0.25 410 5730 7490 0.07 2.0 68 NA NA 0.3 0.7 0.3 46



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-19B


9/24/98 <0.1 439 NA <5 477 <5 724 NA 1460 NA NA 5.2 102 NA 559 17600 17400 NA NA NA NA NA NA NA NA 203.1

6/30/98 <0.1 801 NA NA 434 NA 722 NA 1310 NA NA 4.7 NA NA NA 3920 11600 NA NA NA NA NA NA NA NA 230.18

3/26/98 <0.1 770 <0.03 641 452 <5 713 <0.1 1430 11.7 <0.02 6 101 0.076 538 8190 8370 <0.05 1.19 114 0 0.2 0.2 1 0.1 209.87

3/97 <0.1 536 <0.003 674 497 <5 758 <0.1 1690 13 <0.02 4.94 119 0.063 630 8590 12300 <0.05 1.45 321 NA NA 0.5 1.9 -0.2 223

12/966 0.00 0 0 0 0 0 0 0.00 0 0 0.00 0.04 0 0.000 0 0 9980 0.00 0.00 0 NA NA 0.0 0.0 0.0 0

11/96 <0.1 480 <0.003 624 451 <5 622 <0.1 1350 11 <0.02 7.64 93 0.099 488 6930 10300 <0.05 1.08 189 NA NA 0.1 0.9 0.4 162

8/96 <0.1 470 <0.003 800 453 <5 654 <0.2 1450 11 <0.02 9.74 101 0.078 579 6720 10400 <0.05 1.22 254 NA NA 0.7 1.5 0.1 190

5/96 <0.1 500 <0.015 690 420 <5 690 <0.2 1380 11 <0.02 10.44 95 0.170 511 7900 10900 <0.05 1.15 418 NA NA 0.7 1.5 0.2 203

3/96 <0.3 456 <0.003 670 432 <5 610 <0.5 1340 10 <0.05 7.84 93 0.121 466 7900 10700 <0.05 1.20 214 NA NA 1.4 2.7 0.1 169

10/95 <0.01 500 <0.003 714 401 <5 665 <0.2 1450 12 <0.02 12.34 105 0.137 547 8440 11300 <0.05 1.35 172 NA NA 0.2 NA -0.2 165

7/95 <0.2 528 <0.003 719 430 <1 752 <0.2 1510 13 <0.02 11.2 105 0.171 592 8810 12300 <0.1 1.47 320 NA NA 1.3 NA 0.4 203

4/95 <1 594 <0.001 736 439 <1 781 <1 1630 15 <0.1 10.1 121 0.245 643 9040 12900 <0.5 1.90 357 NA NA 0.3 NA 0.0 182

3/95 <0.2 550 <0.02 755 449 <1 779 <0.2 1690 15 NA 9.3 121 0.130 658 9390 13000 <0.1 1.74 283 NA NA 0.4 NA 0.2 219

12/94 <0.5 728 <0.003 854 479 <1 1070 <0.5 2210 21 NA 8.6 131 0.094 764 12100 16400 <0.05 2.65 331 NA NA 6.1 NA 0.1 299

8/94 <0.1 671 <0.01 800 436 <1 918 0.04 1900 18 <0.02 15.0 121 0.182 664 11100 15000 <0.02 2.23 376 NA NA 0.1 1.5 0.1 173

5/94 <0.5 893 <0.001 818 483 <1 1030 <0.2 2360 20 <0.1 9.0 130 0.211 779 13100 18000 <0.1 2.99 300 NA NA 0.3 2.0 0.0 240

2/94 0.32 1210 <0.005 975 477 <0.1 1560 <0.1 3630 370 <0.05 14.6 168 0.332 1330 19100 26000 <0.05 6.20 280 NA NA 0.5 3.9 0.0 480



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-19C



6/30/98 <0.1 665 NA NA 427 NA 577 NA 1040 NA NA 10 NA NA NA 6340 9510 NA NA NA NA NA NA NA NA 169.25

3/25/98 <0.1 687 <0.015 580 399 <5 525 <0.1 1010 7.62 <0.02 9 84 0.07 387 6140 8650 <0.05 0.67 59 1 0.6 0.2 1.5 0.2 142.17

3/97 <0.1 479 <0.003 636 499 <5 579 <0.1 1290 9.9 <0.02 8.24 108 0.09 498 6410 9380 <0.05 0.81 259 NA NA 0.3 1.7 -0.2 129

12/96 0 0 0 0 0 0 0 0.00 0 0.0 0 0.0 0 0.00 0 0 7500 0 0.00 0 NA NA 0.0 0.0 0.0 0

11/96 <0.1 377 <0.003 <5 411 <5 458 <0.1 1000 7.0 <0.01 5.14 94 0.06 380 5140 7750 <0.05 0.70 136 NA NA 0.4 1.7 0.5 108

8/96 <0.1 372 <0.003 600 385 <5 507 <0.1 996 7.6 <0.01 7.14 90 0.08 403 5940 8290 <0.05 0.71 117 NA NA 0.7 2.1 -0.1 129

5/96 <0.1 400 0.003 630 372 <5 470 <0.1 970 6.6 <0.01 7.04 85 0.11 359 5700 7920 <0.05 0.67 209 NA NA 0.8 2.3 0.0 129

3/96 <0.3 366 0.003 640 389 <5 470 <0.5 983 6.5 <0.05 6.04 88 0.08 341 5800 7950 <0.05 0.80 91 NA NA 1.5 3.0 0.0 115

10/95 <0.1 370 <0.015 610 349 <5 511 <0.1 934 6.8 <0.01 8.34 85 0.09 383 5710 7540 <0.05 0.66 189 NA NA 0.4 NA -0.2 132

7/95 <0.1 421 <0.003 608 388 <1 528 <0.1 1010 7.7 <0.01 7.3 94 0.09 408 5890 8360 <0.05 0.76 175 NA NA 1.3 NA 0.1 134

4/95 <0.2 450 <0.001 658 397 <1 509 <0.2 1130 8.4 <0.02 6.9 101 0.12 428 6120 9040 <0.1 0.90 174 NA NA 0.2 NA 0.1 112

3/95 <0.2 410 <0.02 661 399 <1 517 <0.2 1170 8.5 NA 6.6 108 0.09 440 6420 9050 <0.1 0.95 158 NA NA 0.5 NA 0.1 139

12/94 <0.2 477 <0.003 728 420 <1 646 <0.2 1260 10.0 NA 1.6 104 0.06 449 7700 10400 <0.05 1.08 224 NA NA 0.8 NA -0.4 134

8/94 <0.1 459 <0.01 650 391 <1 585 <0.04 1150 9.1 <0.02 10.0 101 0.07 418 7070 9460 0.04 1.06 208 NA NA 0.2 1.5 0.1 103

5/94 <0.1 648 <0.001 702 428 <1 614 <0.04 1400 9.3 <0.02 11.0 112 0.11 448 7090 11000 <0.02 1.27 220 NA NA 0.1 2.4 0.0 160

2/94 <0.25 1310 <0.005 1130 505 <0.1 1490 <0.1 3500 26.6 <0.05 14.4 208 0.33 1220 19200 24800 <0.05 3.80 410 NA NA 0.4 4.2 3.7 500



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-20



6/2/98 <0.1 1060 0.008 936 496 <5 1170 0.9 2390 10.6 <0.01 <0.1 295 <0.005 592 14900 19700 <0.05 0.8 281 0.3 1 2 7.2 -0.2 203.1

3/10/98 <0.1 1060 <0.015 1010 493 <5 1110 0.8 2440 10.5 <0.05 <0.5 243 <0.025 593 14600 19700 <0.05 0.85 263 0.3 0.3 0.7 8.9 0 209.87

2/97 <0.3 1050 <0.003 957 508 <5 1020 1.30 2590 12.0 <0.05 0.24 280.0 <0.025 690 13300 18400 <0.05 1.0 258 NA NA 5.4 6.4 0.0 183

12/96 <0.5 900 <0.015 840 529 <5 905 1.80 2130 9.9 <0.1 0.44 213.0 <0.025 552 10200 14000 <0.1 0.8 102 NA NA 1.9 6.5 0.5 162

9/96 <0.5 822 <0.003 832 507 <5 885 0.60 1860 7.8 <0.1 0.14 223.0 <0.025 526 10200 14300 <0.1 0.6 2 NA NA 0.5 8.1 0.0 142

5/96 <0.5 1200 <0.003 1100 491 <5 1150 <1 2530 11.4 <0.1 <0.14 278.0 0.027 653 15300 19600 <0.1 0.9 273 NA NA 9.6 7.8 0.0 183

3/96 <0.3 1300 <0.003 1020 472 <5 1200 0.90 2630 12.4 <0.05 <0.14 300.0 0.058 694 16000 21200 <0.05 1.0 208 NA NA 7.1 NA 0.0 223

11/95 <0.5 990 <0.003 944 475 <5 1000 <0.5 2150 8.3 <0.05 0.14 244.0 <0.025 583 13000 17000 <0.05 0.5 171 NA NA 6.3 NA 0.1 140

7/95 <0.2 588 <0.003 800 585 <1 741 <0.2 1370 4.2 <0.02 <0.4 172.0 0.011 511 8880 12500 <0.1 0.2 40 NA NA 0.6 NA 0.5 107

4/95 <1 1780 <0.02 1400 507 <1 1840 6.00 4630 30.4 <0.1 <2 435.0 0.160 1050 2890 33300 <0.5 3.1 359 NA NA 0.5 NA 0.1 252

2/95 <0.5 1240 <0.003 1110 521 <1 1410 3.00 3200 16.2 NA <2 341.0 0.040 784 17500 22300 <0.025 1.4 360 NA NA 1.9 NA -0.1 139

8/94 <0.1 827 <0.01 840 508 <1 983 1.51 1470 5.1 <0.02 3.0 182.0 0.004 472 11200 14200 0.02 0.2 134 NA NA 0.5 3.4 0.1 NA

5/94 <1 878 0.021 890 482 <0.1 880 <0.4 1830 6.7 <0.2 <0.3 212.0 0.009 560 9990 14500 <0.2 0.4 97 NA NA 0.2 4.9 0.0 120

2/94 <0.05 1090 0.005 933 500 <0.1 1040 0.50 2160 8.36 <0.01 0.20 254.0 0.014 626 12500 16050 <0.01 0.5 110 NA NA 0.5 6.8 2.1 160



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-21


9/1/98 1.4 1200 NA 952 477 <5 1370 NA 2900 NA NA 9.8 204 NA 874 17200 22900 NA NA NA NA NA NA NA NA 230.18

5/20/98 0.4 1250 <0.003 1310 477 <5 1350 <0.1 3480 22.6 0.05 10.9 224 0.337 790 20100 26100 <0.05 2.6 260 -0.9 0.3 0.3 3.4 0.2 264.03

3/26/98 <0.3 2340 <0.015 1300 470 <5 1490 <0.2 3320 22.7 <0.05 1.2 206 0.248 972 19200 25400 <0.05 2.7 317 -0.9 0.3 0.4 2.8 0.2 311.42

3/97 <0.3 1440 <0.003 1410 482 <5 1610 <0.3 3820 25 <0.05 10.04 249 0.33 1130 19000 27600 <0.05 2.9 464 NA NA 0.5 5.1 0.0 359

12/96 <0.5 1430 <0.003 1440 520 <5 1570 <0.5 3720 25 <0.1 10.14 250 0.07 1080 19600 26700 <0.1 3.2 299 NA NA 0.6 4.3 0.8 339

8/96 <1 1390 <0.003 1320 489 <5 1520 <1 3590 23 <0.1 9.34 246 0.32 1060 18800 25000 <0.1 3.3 238 NA NA 0.5 4.2 0.5 311

5/96 <0.5 1300 0.015 1350 473 <5 1570 <1 3550 25 <0.1 11.04 226 0.34 1040 18800 25100 <0.1 3.5 167 NA NA 0.7 6.0 0.2 298

3/96 <0.3 1360 <0.015 1520 475 <5 1400 <0.5 3670 28 <0.05 11.84 242 0.32 1080 20000 26000 <0.05 3.6 247 NA NA 1.1 3.8 0.0 278

10/95 1.0 960 <0.015 824 430 <5 1190 12.5 2540 23 <0.05 9.74 177 0.23 820 14500 19200 <0.05 5.1 157 NA NA 0.3 NA -0.2 171

9/95 1.0 960 <0.015 824 430 <1 1190 12.5 2540 23 <0.05 9.74 177 0.23 820 14500 19200 <0.05 5.1 157 NA NA 0.3 NA -0.2 171

7/95 1.2 1050 <0.030 855 454 <1 1230 13.7 2640 26 <0.05 8.0 182 0.23 863 15100 23500 <0.25 5.0 380 NA NA 4.3 NA 0.1 242

3/95 1.2 1310 <0.02 964 489 <1 1180 15.4 3410 34 0.00 8.0 234 0.40 1060 16000 24500 <0.25 6.9 249 NA NA 0.3 NA 0.0 309

12/94 <0.5 1453 <0.003 1400 504 <1 1610 <0.5 3770 29 0.00 9.2 248 0.20 1030 20200 25800 <0.05 3.8 317 NA NA 0.7 NA -0.1 299

8/94 2.2 1420 <0.01 1080 486 <1 1600 23.7 3430 32 <0.05 10.0 243 0.25 1040 19900 27600 <0.06 6.8 627 NA NA 0.4 3.3 0.1 276

5/94 3.3 2140 <0.001 1462 528 <1 1740 24.1 4800 38 <0.1 9.0 316 0.26 1190 25800 33600 <0.1 8.7 640 NA NA 0.2 5.8 0.0 390

2/94 <0.05 2160 0.004 935 501 <0.1 1920 <0.02 4660 21 <0.01 3.7 378 0.07 1140 24900 33190 <0.01 2.6 170 NA NA 1.0 10.0 0.0 330



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-22

10/21/98 <0.1 1.7 NA 284 81.2 <5 66 NA 149 NA NA 7.9 21 NA 79 689 1260 NA NA NA NA NA NA NA NA 48.067


4/21/98 <0.1 74 <0.003 332 112 <5 111 <0.1 252 0.8 <0.01 26 23 <0.005 120 1340 2110 <0.05 0.025 64 0.7 0.7 0.195 1.4 -0.222 94.78

2/23/98 <0.1 50 <0.003 311 102 <5 86 <0.1 197 0.61 <0.01 12.9 25 0.031 106 995 1670 <0.05 0.029 60 -0.1 0.4 0.1 0.5 0 74.47

3/97 <0.1 32 <0.003 305 85 <5 68 <0.1 160 0.51 <0.01 64 22.0 0.02 89 770 1260 <0.05 <0.025 70 NA NA 0.2 0.3 -0.1 56

12/96 <0.1 47 0.015 345 106 <5 96 <0.1 237 0.01 0.01 134 24.0 0.04 126 1080 1840 <0.05 <0.025 636 NA NA 0.3 0.2 0.4 88

9/96 <0.1 65 <0.003 381 127 <5 141 <0.1 345 1.28 <0.01 224 32.0 0.05 166 1650 2520 <0.05 0.04 111 NA NA 0.2 0.2 0.1 135

5/96 <0.1 80 <0.003 404 156 <5 183 <0.1 410 1.52 <0.01 294 32.0 0.07 200 2200 3370 <0.05 0.04 129 NA NA 0.3 0.2 0.0 156

2/96 <0.1 48 <0.003 312 86 <5 80 <0.1 173 0.60 <0.01 734 25.0 0.03 104 890 1530 <0.05 <0.025 57 NA NA 0.4 0.2 0.0 56

11/95 <0.1 46 <0.003 342 94 <5 100 <0.1 200 0.68 <0.01 14 26.0 0.02 118 1040 1830 <0.05 <0.025 42 NA NA 0.3 0.4 0.2 66

9/95 <0.1 83 <0.003 440 166 5.0 172 <0.1 404 1.56 <0.01 28 34.0 0.07 206 1990 3380 <0.05 0.05 162 NA NA 0.3 0.7 0.2 169

4/95 <0.1 75 <0.003 414 168 <1 160 <0.1 390 1.41 NA 31 33.0 0.10 190 1940 3280 <0.05 0.05 145 NA NA 0.1 0.3 -0.1 134

2/95 <0.1 41 <0.003 310 93 <1 80 <0.1 167 0.57 NA 9 23.0 0.02 92 879 1470 <0.05 0.05 41 NA NA 0.3 0.2 0.2 50

12/94 <0.1 35 <0.003 306 89 <1 74 <0.1 150 0.53 NA 8 22.0 0.01 87 761 1290 <0.01 <0.025 31 NA NA 0.0 0.0 -0.2 43

8/94 <0.05 92 <0.001 444 184 <0.1 195 <0.02 470 1.71 <0.01 35 37.6 0.06 233 2410 3660 <0.01 0.06 217 NA NA 0.1 1.4 0.0 156

5/94 <0.05 69 <0.001 327 105 <0.1 109 <0.02 264 0.98 <0.01 21 29.9 0.04 134 1280 2180 <0.01 0.03 79 NA NA 0.0 0.8 0.0 78

2/94 <0.05 60 0.002 316 116 <0.1 103 <0.02 252 0.81 <0.01 17 29.3 0.03 125 1220 1930 <0.01 0.03 77 NA NA 0.1 1.4 0.2 63



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-23



4/21/98 <0.1 887 <0.003 528 289 <5 358 <0.1 695 4.23 <0.01 10 65 0.05 236 4500 6180 <0.05 0.402 121 0.3 0.4 0.043 0.8 0.025 128.63

2/23/98 <0.1 350 <0.003 508 298 <5 318 <0.1 707 4.22 <0.01 7.3 74 0.027 259 4200 5930 <0.05 0.398 86 -0.3 0.4 0.1 1.5 0.2 115.09

3/97 <0.1 38 <0.003 554 311 <5 376 <0.1 751 4.5 <0.01 4.84 79 0.061 270 4180 5940 <0.05 0.43 227 NA NA 0.1 0.8 -0.1 102

12/96 <0.1 308 <0.003 510 258 <5 322 <0.1 583 3.4 0.020 4.64 70 0.037 241 2830 4990 <0.05 0.31 95 NA NA 0.1 0.9 0.3 95

9/96 <0.1 278 <0.003 521 260 <5 315 <0.1 577 3.4 <0.01 4.94 66 0.041 241 3660 4930 <0.05 0.33 110 NA NA 0.0 -0.2 0.5 88

5/96 <0.1 320 <0.003 530 264 <5 348 <0.1 611 3.6 <0.01 5.04 70 0.033 238 4060 5370 <0.05 0.33 119 NA NA 0.4 5.0 0.1 102

2/96 <0.1 350 <0.003 585 306 <5 360 <0.1 771 4.6 <0.01 52.04 87 0.048 286 4540 6950 <0.05 0.48 120 NA NA 0.1 NA 0.0 122

12/95 <0.1 323 <0.003 532 303 <5 360 <0.1 691 4.2 <0.01 6.04 81 0.052 268 4500 6260 <0.05 0.39 113 NA NA 0.4 NA 0.2 121

9/95 <0.1 290 <0.003 570 272 <5 333 <0.1 638 3.7 <0.01 4.9 78 0.057 255 3740 5460 <0.05 0.36 125 NA NA 0.0 NA -0.1 116

4/95 <0.1 350 <0.003 570 302 <1 375 <0.1 737 4.3 NA 4.9 82 0.064 274 4360 6180 <0.05 0.42 160 NA NA 0.0 NA 0.1 112

2/95 <0.1 350 <0.003 602 341 <1 404 <0.1 768 4.6 NA 5.8 78 0.071 266 5060 7270 <0.05 0.46 204 NA NA -0.2 NA -0.1 108

12/94 <0.1 346 <0.003 595 339 <1 403 <0.1 777 4.9 NA 5.7 83 0.032 285 4840 6480 <0.05 0.48 105 NA NA 0.0 NA 0.0 NA

8/94 <0.05 364 <0.001 567 295 <0.1 402 <0.02 705 4.1 <0.01 7.0 81 0.039 267 4600 6040 <0.01 0.41 180 NA NA 0.8 0.9 0.1 NA

5/94 <0.05 441 <0.001 624 347 <0.1 394 <0.02 895 5.6 <0.01 8.0 98 0.056 321 5080 7740 <0.01 0.61 64 NA NA 0.0 0.5 6.9 120

2/94 <0.05 464 0.003 615 354 <0.1 439 <0.02 985 5.6 0.010 8.1 98 0.047 333 5680 7660 <0.01 0.63 210 NA NA 0.0 1.6 0.0 120

CRP-24

12/15/98 <0.1 789 0.006 734 307 <5 438 <0.1 970 7.33 <0.01 4.9 89 0.114 367 6750 8800 <0.05 0.546 74 0.7 0.6 0.0003 1.2 -0.04 128.63

CRP-25

12/28/98 <0.1 1060 <0.003 1180 457 <5 1190 <0.1 2900 15.7 <0.01 9.2 184 0.252 795 18200 22600 0.14 1.3 292 0.2 1.5 5 4.6 -0.1 169.25



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


CRP-26

12/15/98 <0.1 14.8 0.01 413 389 <5 142 1.7 250 0.53 <0.01 <0.1 43 <0.005 114 1720 2820 <0.05 0.411 -13 0.1 0.4 0.5 2.3 -0.02 3.7912

H-33

10/23/98 <0.1 0.6 NA 221 73.9 <5 117 NA 29.3 NA NA <0.1 12 NA 48 79 494 NA NA NA NA NA NA NA NA 60.93

8/19/98 <0.1 2.9 NA 212 85.6 <5 14 NA 35.2 NA NA <0.1 15 NA 57 111 538 NA NA NA NA NA NA NA NA 12.863

4/22/98 <0.1 0.4 <0.003 200 82.2 <5 129 <0.1 33.9 0.06 <0.01 <0.1 13 <0.005 53 106 496 <0.05 <0.025 217 0.2 1 0.267 0.1 0.02 18.956

2/4/98 <0.1 2.4 <0.003 209 80.9 <5 126 <0.1 33 0.07 <0.01 <0.1 17 <0.005 58 87 440 <0.05 <0.025 8.6 0.2 0.8 0.2 0.2 0.1 148.94

1/97 <0.1 1.3 <0.003 276 80 <5 122 <0.1 33.6 0.07 <0.01 <0.14 14.0 <0.005 50.0 75 464 <0.05 0.030 56.0 NA NA 0.3 0.5 -0.2 20

10/96 <0.1 2.6 <0.003 214 82 <5 120 <0.1 33.5 0.06 <0.01 <0.14 15.0 <0.005 54.0 74 466 <0.05 0.023 18.0 NA NA 0.2 -0.5 0.0 16

9/96 <0.1 2.7 <0.003 231 86 <5 121 <0.1 33.0 0.08 <0.01 <0.14 13.0 <0.005 49.0 80 472 <0.05 0.021 16.0 NA NA 0.0 0.5 0.1 14

6/96 <0.1 3.8 <0.003 224 86 <5 120 <0.1 33.1 0.09 <0.01 0.14 14.0 <0.005 55.0 85 508 <0.05 0.025 14.0 NA NA 0.3 1.8 0.6 17

2/96 <0.1 3.5 <0.003 252 78 <5 118 <0.1 30.8 0.08 <0.01 <0.14 14.0 <0.005 51.0 75 502 <0.05 0.003 20.0 NA NA 0.2 NA 0.0 2

12/95 <0.1 3.6 <0.003 206 82 <5 121 <0.1 32.6 0.08 <0.01 <0.14 15.0 <0.005 55.0 79 518 <0.05 0.025 15.0 NA NA 0.3 NA 0.2 17

9/95 <0.1 2.7 <0.003 220 83 <5 115 <0.1 32.4 0.08 <0.01 <0.2 14.0 <0.005 54.0 85 550 <0.05 0.030 15.0 NA NA 0.3 NA -0.1 20

4/95 <0.1 2.8 <0.003 250 85 <1 111 <0.1 39.9 <0.05 <0.01 <0.2 17.0 <0.005 63.0 141 584 <0.05 0.025 11.0 NA NA 0.1 NA 0.0 17

2/95 <0.1 1.5 <0.003 235 92 <1 115 <0.1 34.1 <0.05 NA <0.4 14.0 <0.005 52.0 112 540 <0.05 0.028 24.0 NA NA 0.3 NA 0.1 19

12/94 <0.1 0.9 <0.003 235 85 <1 110 <0.1 29.6 <0.05 <0.01 0.3 NA <0.005 48.0 69 460 <0.05 0.027 18.0 NA NA 0.1 NA 0.1 18

8/94 <0.1 0.8 <0.001 238 86 <1 109 <0.02 31.6 0.01 <0.01 <0.6 13.7 0.001 53.6 101 570 0.010 0.023 20.0 NA NA 0.1 0.8 -0.2 16

5/94 <0.05 1.4 0.00 236 90 <1 112 <0.02 34.9 0.02 <0.01 <0.2 14.2 <0.001 52.9 107 530 <0.01 0.030 19.0 NA NA 0.1 0.8 0.0 20

2/94 <0.05 0.9 0.00 232 80 <1 104 0.07 34.9 0.01 <0.01 <0.2 14.8 <0.001 53.8 80 460 <0.01 0.028 21.0 NA NA 0.7 1.8 0.0 19

TD98-1

12/23/98 <0.1 348 0.004 434 281 <5 619 <0.1 472 1.3 <0.01 20 61 0.037 325 3170 4260 <0.05 0.172 64 0.3 1.1 -0.2 0.5 -0.1 94.78



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


TD98-3

12/18/98 <0.1 0.3 0.004 215 78 <5 140 0.5 31.6 <0.05 <0.01 <0.1 12 <0.005 61 78 560 <0.05 0.076 4.5 3.5 0.4 0.3 0.7 -0.04 2.8434

TD98-4

12/22/98 <0.1 1.4 <0.003 313 126 <5 101 <0.1 126 <0.05 <0.01 1.2 26 <0.005 80 669 1260 <0.05 0.06 10 0.2 1 0.2 0.6 -0.1 13.54

10/7/98 <0.1 2 0.004 326 119 <5 107 <0.1 114 <0.05 <0.01 1 26 0.007 80 555 1120 <0.05 0.082 10 0.6 1.4 0.1 1.1 0.008 10.155

WD-1



6/30/98 <0.1 735 NA NA 280 NA 566 NA 1240 NA NA 31 NA NA NA 7320 10700 NA NA NA NA NA NA NA NA 284.34

3/26/98 <0.1 816 <0.015 665 298 <5 1420 <0.1 1370 8.55 <0.02 26 94 0.153 445 7790 9440 <0.05 1.18 246 -0.8 0.4 0.3 1.3 0.2 257.26

3/97 <0.1 203 <0.003 670 332 <5 608 <0.1 1530 9.2 <0.02 16.04 111 0.16 495 8080 10800 <0.05 1.31 276 NA NA 0.6 2.3 0.0 278

12/96 0.00 0 0.000 0 0 0 0 0.00 0 0.0 0.00 0.04 0 0.00 0 0 8270 0.00 0.00 0 NA NA 0.0 0.0 0.0 0

11/96 <0.1 473 <0.003 594 339 <5 493 <0.1 1190 8.0 <0.02 4.84 97 0.08 362 6000 8730 <0.05 1.25 130 NA NA 0.0 2.5 0.3 129

8/96 <0.2 412 <0.003 610 323 <5 483 <0.2 1150 7.5 <0.02 7.04 94 0.08 391 6060 8530 <0.05 1.12 114 NA NA 0.3 1.2 0.6 156

5/96 <0.1 400 <0.003 620 320 <5 507 <0.2 1180 8.1 <0.02 8.84 94 0.14 378 6500 8730 <0.05 1.22 307 NA NA 0.4 3.0 6.5 162

3/96 <0.3 460 <0.003 460 307 <5 480 <0.5 1170 7.8 <0.05 8.54 93 0.12 363 6600 8980 <0.05 1.20 207 NA NA 1.0 2.1 0.3 156

10/95 <0.1 330 <0.015 556 280 <5 383 <0.1 777 5.3 <0.01 8.3* 76 0.06 260 4770 6380 <0.05 0.68 122 NA NA -0.1 NA 0.0 108

7/95 <0.1 384 0.003 533 274 <1 389 <0.1 787 5.8 <0.01 8.5 78 0.07 276 4230 6930 <0.05 0.72 139 NA NA 0.4 NA 0.3 123

4/95 <0.1 383 <0.001 570 286 <1 382 <0.1 895 6.2 <0.01 8.6 87 0.09 308 5040 7030 <0.05 0.91 170 NA NA -0.1 NA -0.2 107

3/95 <0.2 400 <0.02 577 287 <1 419 <0.2 1020 7.1 NA 9.6 95 0.09 344 5310 7900 <0.1 1.00 157 NA NA 0.1 NA -0.1 123

12/94 <0.2 627 <0.003 776 345 <1 1440 <0.2 1610 11.0 NA 17.0 110 0.09 501 9380 11400 <0.05 1.65 83 NA NA 0.0 NA -0.1 193

8/94 <0.1 415 <0.001 580 305 <0.1 448 <0.04 938 6.5 <0.02 7.9 87 0.06 317 5730 7360 <0.02 0.94 158 NA NA 0.1 2.1 0.1 108

5/94 <0.1 589 <0.001 650 317 <1 513 <0.04 1260 8.4 <0.02 16.0 95 0.11 382 6820 9710 <0.02 1.34 380 NA NA 0.0 1.9 0.0 170



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


WD-2



6/30/98 <0.1 3.7 NA NA 182 NA 113 NA 186 NA NA 0.8 NA NA NA 1200 1970 NA NA NA NA NA NA NA NA 10.832

3/26/98 <0.1 2.7 <0.003 330 215 <5 99 <0.1 217 0.875 <0.01 <0.1 30 <0.005 90 1310 2120 <0.05 0.028 16 0.8 0.7 0.176 0.7 0 10.832

3/97 <0.1 51 <0.003 327 207 330 112 <0.1 217 0.8 0.01 0.44 33 <0.005 95 1380 1820 <0.05 <0.025 11 NA NA 0.2 0.4 -0.1 10

12/96 <0.1 51 <0.003 327 207 <5 112 <0.1 217 0.8 0.01 0.44 33 <0.005 95 1380 1940 <0.05 <0.025 17 NA NA 0.1 1.1 0.0 12

8/96 <0.1 50 <0.003 650 192 <5 112 <0.1 201 0.8 <0.01 0.74 31 <0.005 90 1210 1960 <0.05 0.05 21 NA NA 0.2 1.0 0.3 13

5/96 <0.1 50 <0.003 358 208 <5 121 <0.1 220 0.9 <0.01 0.14 31 <0.005 94 1260 2090 <0.05 0.06 18 NA NA 0.4 1.8 0.1 18

3/96 <0.3 53 <0.003 363 213 <5 110 <0.5 225 1.0 <0.05 0.84 31 <0.005 93 1200 2220 <0.05 0.10 2 NA NA 0.3 1.2 0.1 12

10/95 <0.1 210 <0.015 512 293 <5 329 <0.1 718 5.5 <0.01 2.34 54 0.046 252 4030 5860 <0.05 0.67 30 NA NA 0.1 NA -0.3 47

7/95 <0.1 224 <0.003 491 299 <1 306 <0.1 650 5.2 <0.01 1.9 52 0.052 232 3980 5460 <0.05 0.57 48 NA NA 0.3 NA -0.2 45

4/95 <0.1 212 <0.001 528 307 <1 289 <0.1 708 5.6 <0.01 1.7 59 0.066 263 3770 5460 <0.05 0.66 35 NA NA -0.1 NA -0.1 44

3/95 <0.1 140 <0.02 424 286 <1 216 <0.1 514 3.8 NA 7.6 51 0.038 190 2790 4100 <0.05 0.26 42 NA NA -0.1 NA -0.2 28

12/94 <0.1 64 <0.003 400 247 <1 148 <0.1 277 1.5 NA 2.5 36 0.007 113 1720 2700 <0.05 0.05 14 NA NA -0.1 NA -0.4 15

8/94 <0.05 2 <0.001 444 268 <1 234 <0.02 483 3.0 <0.01 2.1 47 0.031 185 2920 4220 <0.01 0.22 57 NA NA 0.0 1.3 0.0 32

5/94 <0.05 168 <0.001 428 268 <1 210 <0.02 516 3.3 <0.01 3.8 43 0.036 170 2850 4320 <0.01 0.22 54 NA NA 0.1 1.0 0.0 38

2/94 <0.05 191 0.001 457 261 <0.1 243 <0.02 595 3.8 <0.01 2.3 52 0.038 205 3230 4190 0.01 0.27 60 NA NA 0.1 2.2 0.9 39



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


WD-3

12/1/98 <0.1 230 NA 488 373 <5 295 NA 611 NA NA <0. 71 NA 249 3660 5130 NA NA NA NA NA NA NA NA 45.359

9/28/98 0.1 185 NA 270 373 <5 299 NA 594 NA NA <0.1 57 NA 227 3330 5500 NA NA NA NA NA NA NA NA 51.452

6/30/98 <0.1 239 NA NA 349 NA 298 NA 534 NA NA <0.1 NA NA NA 1570 4940 NA NA NA NA NA NA NA NA 52.129

3/26/98 <0.1 182 <0.003 488 376 <5 293 0.3 585 3.65 <0.01 <1 62 <0.005 256 3530 5320 <0.05 0.146 53 0.4 0.1 0.2 1 -0.1 58.222

3/97 <0.1 228 <0.003 524 423 <5 362 <0.1 685 4.27 <0.01 <0.14 74 <0.005 290 3940 5840 <0.05 0.15 2 NA NA 0.30 NA -0.10 66

12/96 0 0 0.000 0 0 0 0 0.00 0 0.00 0.00 0.00 0 0 0 0 5960 0 0.00 0 NA NA 0.00 NA 0.00 0

11/21/96 0 0 0.000 0 0 0 0 0.00 0 0.00 0.00 0.00 0 0 0 0 5440 0 0.00 0 NA NA 0.00 NA 0.00 0

11/11/96 <0.1 198 0.003 474 420 <5 403 <0.1 650 3.63 <0.01 2.60 68 <0.025 328 3430 5750 <0.05 0.11 2 NA NA 0.60 NA 0.20 74

WD-4



5/20/98 0.7 1050 <0.003 1240 476 <5 1140 <0.1 2830 16.4 0.1 10.4 167 0.198 858 16000 21800 <0.05 1.8 288 -0.7 1.1 0.3 2.7 0.09 257.26

3/26/98 0.2 742 <0.003 1110 478 <5 1170 <0.1 2710 17.1 <0.01 0.8 147 0.214 849 14800 20800 <0.05 1.9 177 -0.6 0.8 0.572 2.1 -0.1 264.03

3/97 2.30 1320 <0.003 1200 528 <5 1840 1.1 4510 46.7 <0.05 1.14 218 0.645 1420 24500 32600 <0.05 7.6 3 NA NA 1.2 NA 0 291.11

12/96 0.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3190 0 0 0 NA NA 0 NA 0 0

11/21/96 0.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 35800 0 0 0 NA NA 0 NA 0 0

11/11/96 1.00 2630 <0.015 2300 539 <5 2220 4 5810 27.8 <0.1 114 340 0.567 1500 30200 40600 <0.5 4.36 6 NA NA 1.4 NA 1.3 629.61

WD-5

12/28/98 <0.1 960 <0.003 1000 432 <5 897 <0.1 2180 9.98 <0.01 6.7 182 0.257 611 14400 17200 <0.05 1.2 580 1.3 0.9 0.3 2.2 -0.0005 338.5

10/22/98 <0.1 1100 <0.003 978 405 <5 1000 <0.1 2350 10.5 <0.01 11 211 <0.005 704 11900 17600 <0.05 1.3 333 -0.2 1 1.4 3.1 1.5 243.72



Wel

l #

Alu

min

um(m

g/L

)

Am

mon

ia(m

g/L

)

Ars

enic

(mg/

L)

Bic

arbo

nate

(mg/

L)

Cal

cium

(mg/

L)

Car

bona

te(m

g/L

)

Chl

orid

e(m

g/L

)

Iron

(mg/

L)

Mag

nesi

um(m

g/L

)

Man

gane

se(m

g/L

)

Mol

ybde

ndum

(mg/

L)

Nitr

ate

+ N

itrat

e(m

g/L

)

Pot

assi

um(m

g/L

)

Sele

nium

(mg/

L)

Sodi

um(m

g/L

)

Sulfa

te(m

g/L

)

TD

S(m

g/L

)

Van

adiu

m(m

g/L

)

Zin

c(m

g/L

)

Gro

ssA

lpha

Lea

d-21

0(p

Ci/L

)

Pol

oniu

m(p

Ci/L

)

Rad

ium

-226

(pC

i/L)

Rad

ium

-228

(pC

i/L)

Tho

rium

-230

(pC

i/L)

Nat

ural

Ura

nium

(pC

i/L)


WD-6

12/29/98 2 1310 <0.003 1110 478 <5 1280 0.4 3190 30.5 <0.01 39 139 0.343 941 21000 24900 0.08 3.5 355 0.9 1.3 0.3 1.7 -0.05 169.25

10/8/98 1.1 1830 <0.003 1240 496 <5 1580 1.2 3720 35.8 0.11 40 146 0.44 1070 19500 29700 0.07 4.3 354 0.2 0.7 1.4 5 -0.03 223.41

WD-7

12/28/98 11.4 1780 <0.003 330 458 <5 1790 5.2 4520 61.4 0.08 139 83 0.82 1480 30400 35500 0.22 8.7 461 1.7 1 0.7 0.9 0.3 155.71

10/9/98 12.6 1980 <0.003 218 417 <5 1740 2.5 3940 55.1 0.12 90 66 0.75 1280 22300 33900 0.22 7.9 -43 1.2 0.3 0.8 0.4 0.1 128.63

WD-8

12/29/98 0.9 3670 <0.003 1450 537 <5 3240 2.3 7860 54.8 0.2 119 303 1.32 1960 52400 61200 <0.05 7.2 1240 1.2 0.8 1.3 4.8 -0.02 812.4

1. NA: Not Analyzed2. 777: Highest Value of Analyte Reported in Cited Documents3. 11/15/95: Analytical Results for This Sampling Event Are Exactly/Almost Exactly the Same as the Analytical Results of the Next Sampling Date4. Reported Analytical for Nitrate Only Rather Than for Nitrate + Nitrite5. 0.0: Results Should be Recorded As Less Than the Limit of Detection6. 11/15/95 : Results Listed as 0 or 0.00 But Sample Was Not Analyzed For These Materials! *: Reported Analytical Result for Nitrite Only Rather Than for Nitrate + Nitrite